Computer Virus

A computer virus is a program, usually small or very small, with the following properties: infection; multiplication; possession of a harmful function.

The function of infection allows the virus to get into program files in data files using a scripting language, or part of the diskette or hard disk containing a small program (boot sector). When access to these programs or sector, the virus code will run first so silent (multiplication phase during which it will infect other files) and visible (activation of the harmful function).

Harmful function can be triggered by very different factors depending on the virus (after n replications at a fixed date in the execution of specific tasks ...). It can be limited to display an annoying message or, more generally, lead to serious disruption of the computer (slow operation, deletion or corruption of files, formatting the hard drive ...). Viruses are parasites programs to be hosted in other files (or executable disk sector).

Is often used improperly to refer to the word virus other malicious programs (malware), especially worms.

How to remove a computer virus?

If your computer is infected with a virus, it is essential to remove it as quickly as possible. To find out quickly if your computer contains viruses, use antivirus online scanner, such as Microsoft Security scanner. Safety scanner is a free online service facilitating the identification and removal of viruses and cleaning your hard drive. It also improves the overall performance of the computer.

If you are unsure whether your computer is infected with a virus, see How to tell if my computer is infected with a virus? To discover the telltale symptoms. To try a different online scanner, click the links for accessing offered by other publishers scanners contained in the Web page publishers of security software for Windows.
If you can connect to the Internet

If you have access to websites using web browser, perform an online scan.

To use the scanner Microsoft Security

1. See the Microsoft Safety Scanner Web page to download the scanner.
2. Click on the Download link and follow the instructions that appear on the screen.

If you are unable to connect to the Internet
If you are unable to access the security scanner Microsoft online, try restarting your computer in safe mode with network support.
To restart in Safe Mode with networking support

1. Restart your computer.
2. When the logo of the manufacturer of the computer is displayed, press the F8 key and hold.
3. In the Advanced Boot Options screen, use the arrow keys to select Safe Mode with networking support and press Enter.
4. Log on to your computer using a user account with administrator rights.
5. Follow the steps above to run the Microsoft Safety Scanner.

For information about different startup modes, see Start your computer in safe mode.

If you are still unable to access the Internet after restarting in safe mode, try to reconfigure the proxy settings of Internet Explorer. The following procedure resets the proxy settings RegistreWindows to allow you to access the Internet again.

To reset Internet Explorer settings

1. In Windows 7, click the Start button DémarrerImage. In the search box, type run, and then, in the list of results, click Run.
        - Or -
        In Windows Vista, click the Start button DémarrerImage, and then click Run.
        - Or -
        In Windows XP, click the Start button and click Run.
2. Copy and paste the following text in the Open box in the Run dialog box:
        reg add "HKCU \ Software \ Microsoft \ Windows \ CurrentVersion \ Internet Settings" / v ProxyEnable / t REG_DWORD / d 0 / f
3. Click OK.
4. In Windows 7, click the Start button DémarrerImage. In the search box, type run, and then, in the list of results, click Run.
        - Or -
        In Windows Vista, click the Start button DémarrerImage, and then click Run.
        - Or -
        In Windows XP, click the Start button and click Run.
5. Copy and paste the following text in the Open box in the Run dialog box:
        reg delete "HKCU \ Software \ Microsoft \ Windows \ CurrentVersion \ Internet Settings" / v ProxyServer / f
6. Click OK.

Restart Internet Explorer, and then follow the steps mentioned above to run the scanner.

Manually delete a virus

Sometimes a virus must be removed manually. This procedure can be technically complex. Only users who are familiar with the Windows registry and know how to view and delete system files and programs in Windows must undertake this operation.

Start by identifying the name of the virus by running your antivirus program. If you do not have an antivirus program or if your program does not detect the virus, you may be able to identify it by searching for information about his behavior. Write down the text of the messages displayed by the virus, or if you received the virus through e-mail, note the text that appears in the subject line or name of the file attachment of the message. Then search on the Web site of a publisher antivirus messages and references you noted, to find the name of the virus and the instructions to remove it.

Recovery and Prevention

Once you have removed the virus, you may need to reinstall some software or restore lost information. By performing regular backups of your files, you will limit the risk of data loss in case of new infection. If you still have never made a backup, please do so now.

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