Step 1
Open the command promptStep 2
Type the following commandFor example if you want to ping google.com
Showing posts with label tips. Show all posts
Showing posts with label tips. Show all posts
Wednesday, 7 November 2012
How to export the result of ping command
For example if you want to ping google.com
Tuesday, 23 October 2012
An Interesting Trick to Hide the Data in Notepad.
Steps to hide text in a Notepad
- Open your command prompt
- Type cd.. to move to C:\> drive or Type cd desktop to move to your desktop.
- Type the below code in your command prompt
- Write some data and save (Ctrl+s) the file.
- Browse to the file location and Open filename.txt you cannot see any data in the file.
To retrieve the hidden data open command prompt and type the same command.
Monday, 22 October 2012
How to Hide your Secret Files inside an Image Without any Software
NOTE: you must need two images and your files should be Compressed into .rar or .zip or anyother extension
Step 1
Open your command promptStep 2
Now Type the following commandlinee.g : copy /b a.jpg + b.rar c.jpg
Now your a.jpg image & b.rar File will be copied inside the c.jpg
To view the hidden file open the c.jpg using winzip or winrar etc.
Thursday, 18 October 2012
Free online file converter
How to Use this service
Go to www.online-convert.com and select the tool you want to use. Suppose i wish to convert an image to PNG format. Select the conversion and click on go.Now browse the file or enter the web URL of the image. Select the quality settings and then click on convert.
After the conversion, you will find the download link of the converted file.
Download the file and enjoy. This is a nice online converter file which can be used any time from any where.
How to Regain Access to your Hacked Facebook Account Easily
Step 1
Visit http://www.facebook.com/hacked.Step 2
Click My Account Is Compromised as shown in below screenshot
Step 3
Now enter your Email,Phone Or Username and Click on Search
And now identify your account & now click on continue without entering the password and then you will be redirected to another page as show in Step 4.
Step 4
Now choose your option to reset your password....
Wednesday, 17 October 2012
How to Bypass CYBEROAM
TECHNIQUES TO BYPASS OR HACK CYBEROAM
USE TOR
- Download TOR Browser
- Install or Extract TOR browser in a portable USB drive.
- Plug your USB drive in computer and start TOR browser and start surfing on Internet, Now all websites like FACEBOOK, ORKUT, BLOGGER are accessible.
CACHED HACK
This HACK work for all blocked websites. You can easily open blocked websites using this technique. When you search anything using google In the each search result there are two things in blue color prior to URL i.e Cached and Similar. To view that blocked Website You have to click on Cached Click on CACHED to access blocked websites.PING HACK
There are millions of Proxy websites available on Internet. Find non popular proxy websites to open blocked websites. Then follow these steps- Start Command Prompt.
- Type Ping www.proxywebsite.com
- Copy IP address of that proxy website and paste into on you browser.
- Your blocked website will be unblocked.
Note : Try to find non popular proxy website, there are lots of proxy websites available on Internet and not be able to cyberoam block all proxy websites from Internet so this hack will surely work if you find non popular proxy website which make fool to cyberoam.
HTTPS HACK
Try to find proxy website that uses https i.e. SSL proxies are also not blocked by any Cyberoam.Tuesday, 16 October 2012
What is Denial Of Service (DoS) Attacks ?
Denial Of Service (DoS) Attacks
A denial of service (DoS) attack is an attack that clogs up so much memory on the target system that it can not serve it’s users, or it causes the target system to crash, reboot, or otherwise deny services to legitimate users.There are several different kinds of dos attacks as discussed below:-Ping Of Death
The ping of death attack sends oversized ICMP datagrams (encapsulated in IP packets) to the victim.The Ping command makes use of the ICMP echo request and echo reply messages and it’s commonly used to determine whether the remote host is alive. In a ping of death attack, however, ping causes the remote system to hang, reboot or crash. To do so the attacker uses, the ping command in conjuction with -l argument (used to specify the size of the packet sent) to ping the target system that exceeds the maximum bytes allowed by TCP/IP (65,536).example:- c:/>ping -l 65540 hostname
Fortunately, nearly all operating systems these days are not vulnerable to the ping of death attack.
Teardrop Attack
Whenever data is sent over the internet, it is broken into fragments at the source system and reassembled at the destination system. For example you need to send 3,000 bytes of data from one system to another. Rather than sending the entire chunk in asingle packet, the data is broken down into smaller packets as given below:* packet 1 will carry bytes 1-1000.
* packet 2 will carry bytes 1001-2000.
* packet 3 will carry bytes 2001-3000.
In teardrop attack, however, the data packets sent to the target computer contais bytes that overlaps with each other.
(bytes 1-1500) (bytes 1001-2000) (bytes 1500-2500)
When the target system receives such a series of packets, it can not reassemble the data and therefore will crash, hang, or reboot.
Old Linux systems, Windows NT/95 are vulnerable.
SYN – Flood Attack
In SYN flooding attack, several SYN packets are sent to the target host, all with an invalid source IP address. When the target system receives these SYN packets, it tries to respond to each one with a SYN/ACK packet but as all the source IP addresses are invalid the target system goes into wait state for ACK message to receive from source. Eventually, due to large number of connection requests, the target systems’ memory is consumed. In order to actually affect the target system, a large number of SYN packets with invalid IP addresses must be sent.Land Attack
A land attack is similar to SYN attack, the only difference being that instead of including an invalid IP address, the SYN packet include the IP address of the target sysetm itself. As a result an infinite loop is created within the target system, which ultimately hangs and crashes.Windows NT before Service Pack 4 are vulnerable to this attack.Smurf Attack
There are 3 players in the smurf attack–the attacker,the intermediary (which can also be a victim) and the victim. In most scenarios the attacker spoofs the IP source address as the IP of the intended victim to the intermediary network broadcast address. Every host on the intermediary network replies, flooding the victim and the intermediary network with network traffic.Result:- Performance may be degraded such that the victim, the victim and intermediary networks become congested and unusable, i.e. clogging the network and preventing legitimate users from obtaining network services.
UDP – Flood Attack
Two UDP services: echo (which echos back any character received) and chargen (which generates character) were used in the past for network testing and are enabled by default on most systems. These services can be used to launch a DOS by connecting the chargen to echo ports on the same or another machine and generating large amounts of network traffic.Saturday, 6 October 2012
Resetting Ubuntu 11.10 Password
If you’ve forgotten your Ubuntu 11.10 Password you can reset it
within minutes. I will tell you two methods to reset your Ubuntu
Password. The first one is by booting it in recovery mode and second one
is by using any Live OS.
Let’s start with the recovery mode first as it takes less time and easy to do in comparison to the second one method:
Boot up your Ubuntu. Press and Hold ‘Shift’ Key while the machine is booting. You will get the GRUB Menu like this:
Select the second option which is ‘Recovery Mode’ and press Enter. After pressing enter system will start booting and you will get a list of options like this:
After that we need to make the filesystem writable so that we can change the password. To make it writable select the 3rd option ‘remount’ and press Enter. After pressing enter you will get the following:
Press Enter here and you will get recovery menu with a list of options again:
Select the last option ‘root’ and press enter. If the root account password is not set then you will get a shell prompt like this:
Now you can enter commands to reset the password of any account.
#passwd <username>
Enter the new password and confirm it by entering again.
Now enter command ‘sync’.
Now Enter the command ‘reboot –f’ to reboot.
Now you can login with your new password.
Now if the root account is having a password then you will not get the shell at recovery mode. In this case you need to boot your ubuntu machine with any Live OS. I will be booting it again with Ubuntu 11.10.
Boot your machine with Ubuntu 11.10. You will get a screen asking to just try this as a live cd or install it on your machine:
Click on ‘Try Ubuntu’ to use it as a LIVE OS.
You will get desktop a live user. Now you need to mount the file system to change the password. First we need to know the device name of the filesystem to mount. To get the name of device enter the command ‘sudo fdisk –l’
Now as you can see the system type of /dev/sda1 is Linux.
So we need to mount the device ‘/dev/sda1’.
To mount this device enters the following command.
#sudo mount /dev/sda1 /tmp
Now we need to enter the command ‘sudo chroot /tmp’ to get the shell on your filesystem:
Now we’ve got the shell we can change the password of any user by entering the command ‘passwd <username>’
Now restart the machine by entering the command ‘reboot’ and you will be able to login with your new password.
Let’s start with the recovery mode first as it takes less time and easy to do in comparison to the second one method:
Boot up your Ubuntu. Press and Hold ‘Shift’ Key while the machine is booting. You will get the GRUB Menu like this:
Select the second option which is ‘Recovery Mode’ and press Enter. After pressing enter system will start booting and you will get a list of options like this:
After that we need to make the filesystem writable so that we can change the password. To make it writable select the 3rd option ‘remount’ and press Enter. After pressing enter you will get the following:
Press Enter here and you will get recovery menu with a list of options again:
Select the last option ‘root’ and press enter. If the root account password is not set then you will get a shell prompt like this:
Now you can enter commands to reset the password of any account.
#passwd <username>
Enter the new password and confirm it by entering again.
Now enter command ‘sync’.
Now Enter the command ‘reboot –f’ to reboot.
Now you can login with your new password.
Now if the root account is having a password then you will not get the shell at recovery mode. In this case you need to boot your ubuntu machine with any Live OS. I will be booting it again with Ubuntu 11.10.
Boot your machine with Ubuntu 11.10. You will get a screen asking to just try this as a live cd or install it on your machine:
Click on ‘Try Ubuntu’ to use it as a LIVE OS.
You will get desktop a live user. Now you need to mount the file system to change the password. First we need to know the device name of the filesystem to mount. To get the name of device enter the command ‘sudo fdisk –l’
Now as you can see the system type of /dev/sda1 is Linux.
So we need to mount the device ‘/dev/sda1’.
To mount this device enters the following command.
#sudo mount /dev/sda1 /tmp
Now we need to enter the command ‘sudo chroot /tmp’ to get the shell on your filesystem:
Now we’ve got the shell we can change the password of any user by entering the command ‘passwd <username>’
Now restart the machine by entering the command ‘reboot’ and you will be able to login with your new password.
How to Hide a folder without any third party Software
To Hide:
Rename any folder with extension
{645FF040-5081-101B-9F08-00AA002F954E}
For eg,If u’ve a folder with name “abc”
press F2,
then type,
abc.{645FF040-5081-101B-9F08-00AA002F954E}
and Press Enter.To get back to its original form :
Make a new batch file with any name and type
ren abc.{645FF040-5081-101B-9F08-00AA002F954E} abc
and save it as abc.bat
How to access blocked sites or country restricted sites
Stealthy allows you to instantaneously get and setup a working proxy from a click of a button.
Does your country/company blocks you out of facebook, youtube or others?
Stealthy is the solution for you.
- Hide your IP address for your privacy online.
- Access all content privately without censorship; bypass firewalls.
The term Stealthy refers to military aircraft that can penetrate into enemy territory undetected by radar. In a way, that’s what this browser extension does.
Some organizations and governments block access to web pages, and certain online services are not available in all countries. With Stealthy, users can make themselves undetectable, and thereby able to bypass the censorship.
This can be tremendously important in countries like China or Iran, where regimes censor the Internet. But even in countries like Germany, many people cannot watch music videos on YouTube because of a licensing dispute with GEMA. With Stealthy installed, this is not an issue, as you can get a foreign IP address and play the videos without issue.
Once installed, a small stealth aircraft icon will be appear in your navigation bar. The color is red by default, indicating Stealthy is off. After clicking on it, Stealthy automatically searches for an appropriate proxy, sets up your browser, and turns the icon green, meaning you are now in Stealth mode.
How does it works:
The extension works by placing an icon on the upper right part of your browser, after installation Stealthy will be off by default, you will need to turn it on. With the click it switches between ON (green icon) and OFF (red icon), in the (unlikely) case that the proxy assigned to you doesn't work or is too slow you should turn Stealthy off and on again in order to get a new one.
Configuration:This is the preferences window, you access there by clicking on the small arrow in the right side of Stealthy's icon.
Yo can chose between uses:
- Normal use for achieve anonymity
- Pretend that you are in the US
- Use a service that requires you to be in an specific country by providing the country code.
You can also chose the behavior on start-up:
- Leave it as it was previously set
- Automatically set it Off
- Automatically set it On.
The last option cleanup your network settings in case you lost connectivity to internet, or Stealthy refuses to work
Stealthy for Chrome (recommended):
http://chrome.google.com/webstore/detail/ieaebnkibonmpbhdaanjkmedikadnojehttp://addons.mozilla.org/en-us/firefox/addon/stealthy/
Tuesday, 17 April 2012
6 common Windows 7 disasters & how to fix it
1.Your PC Won't Boot
If turning on your PC doesn't bring you into Windows, try booting from a Windows 7 DVD or a recovery disc.
You may already have the DVD. If Windows 7 didn't come with your computer but you installed it yourself, you have the disc. If you don't have it, you can borrow someone else's disc.
Alternatively you can borrow someone else's Windows 7 computer and use it to create a System Repair Disc (you can also do this on your own PC before it has a problem). To create the disc, click Start, type system repair, select Create a System Repair Disc, and follow the prompts.
If your computer won't boot from the CD, go into its setup screen and change the boot order so that the optical or CD/DVD drive comes before the hard drive. I can't tell you exactly how to do this since it differs from one PC to another. When you first turn on the computer, look for an on-screen message telling you to press a particular key 'for setup'.
If your PC fails before you can enter setup or boot from a CD, you have a hardware problem. If you're not comfortable working inside a PC, take it to a professional.
But let's assume that the CD boots. When it does, follow the prompts. Likely the utility will tell you very soon that there's a problem, and it will ask if you want to fix the problem. You do.
If it doesn't ask you, or if the disc can't fix the issue, you'll see a menu with various options. Startup Repair and System Restore are both worth trying.
2.You Can't Access the Hard Drive
If Windows can't boot because the PC can't read the hard drive, none of the solutions above will work. But that's not the worst of it: Unless you have a very up-to-date backup, all of your files are locked away on a possibly dead hard drive. Secondary drives you don't boot off of, both internal and external, also can die with important data locked away on them.
If the drive is making noises that you've never heard before, shut off the PC immediately. In that case you have only one possible solution, and it's expensive: Send the drive to a data-retrieval service. Drivesavers and Kroll Ontrack are the best known, although they're not necessarily better than smaller, cheaper companies. Expect to pay hundreds or even thousands of dollars. If your drive sounds OK, however, you may be able to recover the files for only $70 with GetData's Recover My Files.
If the sick drive is the one you use to boot Windows, you'll have to remove it from the PC and access it on another computer. You can do so by making it a secondary drive in a desktop PC, or by using a SATA-USB adapter such as the Bytecc USB 2.0 to IDE/SATA Adapter Kit.
The free, demo version of Recover My Files will show you which files can be recovered and even display their contents. Once you've paid the $70 license fee, the program can copy the files to another drive. If that doesn't work, you'll need to use a retrieval service.
3.Blue Screens of Death Attack Your PC Regularly
Windows 7 keeps logs of "Stop Errors." To view the logs and make sense of them, download and run BlueScreenView, a free, portable program by NirSoft. The program shows you what drivers were running at the time of the crash, and highlights the likeliest suspects. If the same drivers come up from multiple crashes, you should definitely update them.
Speaking of updating drivers, you should make sure that all of them are current. SlimWare Utilities' free SlimDrivers makes this chore remarkably easy, as it scans Windows and lists which drivers need to be updated. If you register (that's free, too), it will find the drivers and run the update for you. It even offers to create a restore point before each update. Don't update all of your drivers at once, however; if you do, and one of them makes things worse, you'll have a tough time figuring out which one.
Frequent BSoDs can also be a sign of hardware problems, especially bad RAM. Although Windows 7 has its own memory-diagnostics program, I prefer the free Memtest86+, which you have to boot separately. You can download the program either as an .iso file--from which you can create a bootable CD--or as an .exe file that will install the program and its bootable operating system onto a flash drive.
4.No One Has the PC's Administrator Password
If the wrong person leaves your company in a huff, one or more PCs could be left stranded. With no one in the company knowing the password to an administrator-level account, you can't install software, change important settings, or possibly access encrypted data.
Fortunately, you can remove the password, letting you log on to that account. You do that with the Offline NT Password & Registry Editor, a bootable, text-based free program that you download as an .iso file. Double-click that file, and Windows 7 will start the process of burning it to a CD.
Boot the CD and follow these instructions. I've put the on-screen prompts in italics. After you type your answer, press Enter.
boot: Just press Enter.
Select: [1]: Above the prompt you'll see a list of hard-drive partitions. Select the right one by typing that number.
What is the path to the registry directory?...: The default is probably correct. Just press Enter.
[1]: 1
What to do? [1] ->: 1
or simply enter the username...: Type the name of the administrator account. If you're not sure what it is, all of the account names are listed above the prompt.
Select: [q] >: 1
Select: ! - quit...: !
What to do [1]: q
About to write file(s) back...: y
New run? [n]: n
# Remove the CD and reboot.
You should now be able to log on to the administrator account without a password. For security purposes, don't forget to create a new password for the account. Just be sure to remember what it is.
5.You Think Your PC Is Infected
If your regular antivirus program--the one you already have up and running -- hasn't stopped the questionable software, it probably can't. What you need is a second opinion--and possibly a third and a fourth.
Start with the free version of Malwarebytes Anti-Malware, a utility with an exceptional record of finding and removing malware. Download it, install it, launch it, update the database, and then perform a full scan.
Since installing and updating a cleaning utility are tasks that the infection may interfere with, it's a good idea to follow your Malwarebytes scan with other scans that don't require an installation or even an update.
On someone else's PC, download SuperAntiSpyware Portable and copy it to a flash drive. Boot the infected PC into Safe Mode, plug in the flash drive, and run the program. Since SuperAntiSpyware.com updates the portable program every day or two, you don't need to update it before the scan.
For a fourth opinion, try the F-Secure Rescue CD. This is another .iso file from which you can burn a bootable CD. Just boot from the CD and run the scan. The program will try to update its database over the Internet. If it can't, you can download an update on another PC, put it on a flash drive, and keep that plugged in while running F-Secure on the infected PC.
6.An Important File Disappears
Your PowerPoint presentation is beautiful. It's perfect. It's...where is it? Click the Start menu, type the file's name, and see what turns up.
Maybe you've renamed it accidentally. Click Start, type a word that's in the presentation but not in many other files, and see if that gets better results. If it pulls up a lot of results, click See more results so that you can sort the found files by date. No luck? Try the Recycle Bin. Maybe you deleted the file.
Dead end? Don't panic. You can always restore the file from the backup you made yesterday.
You don't back up? IAs for the file you need to find today, you'll have to use file-recovery software. Before I discuss specific programs, I need to lay down one absolute rule about using them: Until you've either recovered the file or given up, do not write to your hard drive.
Following this rule requires you to use portable file-recovery software. Download the utility on another PC and save it to a flash drive. Plug that drive into your PC, and launch the program from there.
The rule also means that you shouldn't restore your file to its original location. Save it to the flash drive, as well.
With luck, either of the following two utilities will be able to find and recover your missing file. First, try the free Recuva Portable. It's fast and simple, it can preview image formats, and it works reliably most of the time.
If that doesn't work, try Software Shelf's File-Rescue Plus. It costs $40, but you can recover up to five files with the free demo version. Strictly speaking, File-Rescue Plus isn't portable, but you have a work-around. Install it onto another computer, and then copy the program file, FileRescuePlus.exe, to your flash drive. After you pay the $40, use Notepad to create a file called key.ini containing nothing but the license key that Software Shelf sent you after you bought the program. Place key.ini on the flash drive, in the same folder as the program file.
If turning on your PC doesn't bring you into Windows, try booting from a Windows 7 DVD or a recovery disc.
You may already have the DVD. If Windows 7 didn't come with your computer but you installed it yourself, you have the disc. If you don't have it, you can borrow someone else's disc.
Alternatively you can borrow someone else's Windows 7 computer and use it to create a System Repair Disc (you can also do this on your own PC before it has a problem). To create the disc, click Start, type system repair, select Create a System Repair Disc, and follow the prompts.
If your computer won't boot from the CD, go into its setup screen and change the boot order so that the optical or CD/DVD drive comes before the hard drive. I can't tell you exactly how to do this since it differs from one PC to another. When you first turn on the computer, look for an on-screen message telling you to press a particular key 'for setup'.
If your PC fails before you can enter setup or boot from a CD, you have a hardware problem. If you're not comfortable working inside a PC, take it to a professional.
But let's assume that the CD boots. When it does, follow the prompts. Likely the utility will tell you very soon that there's a problem, and it will ask if you want to fix the problem. You do.
If it doesn't ask you, or if the disc can't fix the issue, you'll see a menu with various options. Startup Repair and System Restore are both worth trying.
2.You Can't Access the Hard Drive
If the drive is making noises that you've never heard before, shut off the PC immediately. In that case you have only one possible solution, and it's expensive: Send the drive to a data-retrieval service. Drivesavers and Kroll Ontrack are the best known, although they're not necessarily better than smaller, cheaper companies. Expect to pay hundreds or even thousands of dollars. If your drive sounds OK, however, you may be able to recover the files for only $70 with GetData's Recover My Files.
If the sick drive is the one you use to boot Windows, you'll have to remove it from the PC and access it on another computer. You can do so by making it a secondary drive in a desktop PC, or by using a SATA-USB adapter such as the Bytecc USB 2.0 to IDE/SATA Adapter Kit.
The free, demo version of Recover My Files will show you which files can be recovered and even display their contents. Once you've paid the $70 license fee, the program can copy the files to another drive. If that doesn't work, you'll need to use a retrieval service.
3.Blue Screens of Death Attack Your PC Regularly
Windows 7 keeps logs of "Stop Errors." To view the logs and make sense of them, download and run BlueScreenView, a free, portable program by NirSoft. The program shows you what drivers were running at the time of the crash, and highlights the likeliest suspects. If the same drivers come up from multiple crashes, you should definitely update them.
Speaking of updating drivers, you should make sure that all of them are current. SlimWare Utilities' free SlimDrivers makes this chore remarkably easy, as it scans Windows and lists which drivers need to be updated. If you register (that's free, too), it will find the drivers and run the update for you. It even offers to create a restore point before each update. Don't update all of your drivers at once, however; if you do, and one of them makes things worse, you'll have a tough time figuring out which one.
Frequent BSoDs can also be a sign of hardware problems, especially bad RAM. Although Windows 7 has its own memory-diagnostics program, I prefer the free Memtest86+, which you have to boot separately. You can download the program either as an .iso file--from which you can create a bootable CD--or as an .exe file that will install the program and its bootable operating system onto a flash drive.
4.No One Has the PC's Administrator Password
If the wrong person leaves your company in a huff, one or more PCs could be left stranded. With no one in the company knowing the password to an administrator-level account, you can't install software, change important settings, or possibly access encrypted data.
Fortunately, you can remove the password, letting you log on to that account. You do that with the Offline NT Password & Registry Editor, a bootable, text-based free program that you download as an .iso file. Double-click that file, and Windows 7 will start the process of burning it to a CD.
Boot the CD and follow these instructions. I've put the on-screen prompts in italics. After you type your answer, press Enter.
boot: Just press Enter.
Select: [1]: Above the prompt you'll see a list of hard-drive partitions. Select the right one by typing that number.
What is the path to the registry directory?...: The default is probably correct. Just press Enter.
[1]: 1
What to do? [1] ->: 1
or simply enter the username...: Type the name of the administrator account. If you're not sure what it is, all of the account names are listed above the prompt.
Select: [q] >: 1
Select: ! - quit...: !
What to do [1]: q
About to write file(s) back...: y
New run? [n]: n
# Remove the CD and reboot.
You should now be able to log on to the administrator account without a password. For security purposes, don't forget to create a new password for the account. Just be sure to remember what it is.
5.You Think Your PC Is Infected
If your regular antivirus program--the one you already have up and running -- hasn't stopped the questionable software, it probably can't. What you need is a second opinion--and possibly a third and a fourth.
Start with the free version of Malwarebytes Anti-Malware, a utility with an exceptional record of finding and removing malware. Download it, install it, launch it, update the database, and then perform a full scan.
Since installing and updating a cleaning utility are tasks that the infection may interfere with, it's a good idea to follow your Malwarebytes scan with other scans that don't require an installation or even an update.
On someone else's PC, download SuperAntiSpyware Portable and copy it to a flash drive. Boot the infected PC into Safe Mode, plug in the flash drive, and run the program. Since SuperAntiSpyware.com updates the portable program every day or two, you don't need to update it before the scan.
For a fourth opinion, try the F-Secure Rescue CD. This is another .iso file from which you can burn a bootable CD. Just boot from the CD and run the scan. The program will try to update its database over the Internet. If it can't, you can download an update on another PC, put it on a flash drive, and keep that plugged in while running F-Secure on the infected PC.
6.An Important File Disappears
Your PowerPoint presentation is beautiful. It's perfect. It's...where is it? Click the Start menu, type the file's name, and see what turns up.
Maybe you've renamed it accidentally. Click Start, type a word that's in the presentation but not in many other files, and see if that gets better results. If it pulls up a lot of results, click See more results so that you can sort the found files by date. No luck? Try the Recycle Bin. Maybe you deleted the file.
Dead end? Don't panic. You can always restore the file from the backup you made yesterday.
You don't back up? IAs for the file you need to find today, you'll have to use file-recovery software. Before I discuss specific programs, I need to lay down one absolute rule about using them: Until you've either recovered the file or given up, do not write to your hard drive.
Following this rule requires you to use portable file-recovery software. Download the utility on another PC and save it to a flash drive. Plug that drive into your PC, and launch the program from there.
The rule also means that you shouldn't restore your file to its original location. Save it to the flash drive, as well.
With luck, either of the following two utilities will be able to find and recover your missing file. First, try the free Recuva Portable. It's fast and simple, it can preview image formats, and it works reliably most of the time.
If that doesn't work, try Software Shelf's File-Rescue Plus. It costs $40, but you can recover up to five files with the free demo version. Strictly speaking, File-Rescue Plus isn't portable, but you have a work-around. Install it onto another computer, and then copy the program file, FileRescuePlus.exe, to your flash drive. After you pay the $40, use Notepad to create a file called key.ini containing nothing but the license key that Software Shelf sent you after you bought the program. Place key.ini on the flash drive, in the same folder as the program file.