How To Remove A Virus
From A Computer

You found out your PC has been infected. Now how to remove the virus from the computer?

You can try to do this on your own when you follow the guidelines below. However, be aware that removing malware such as computer viruses can be tricky. If your knowledge of PC is not sufficient, I strongly recommend getting professional help. Otherwise you might cause unnecessary damage to your system resulting in even greater problems.

Are you ready to do it yourself? Here's a step-by-step guide how to remove viruses from computers.

Tip: print this page and keep it in a safe place!

1. If you think that your computer is infected with a virus stop working on your computer immediately. Save your current work.

2. Shutdown your computer by using the power switch.

3. Turn on your computer again and change boot order in the BIOS so you can boot from an emergency boot CD or write-protected USB stick. Of course, you should have own these or made them in advance as a security backup.

how to remove virus from compute

4. Execute a full system scan with the antivirus software of your choice. Make sure that your antivirus signature files have been updated before you scan your computer. Otherwise your security software may not find a current computer virus.

5. Backup your personal data if you have no backup available yet.

6. Remove the virus from your computer depending on the detected virus type. Today’s antivirus software normally identifies and removes a virus automatically. However, if this does not work check the virus databases of the major antivirus software vendors as they often provide detailed information how to proceed with a specific virus. Write down the names and locations of each file which have been removed by your antivirus software system scan (you will need that list later on).

7. Reboot again (by using the power switch) from your emergency boot medium and rescan your harddisks and other mediums to make sure that all traces of the found viruses have been removed. Based on my experience it is good to use an emergency boot medium with a different antivirus software product for the rescan as no antivirus software is able to find all the computer viruses that exist.

8. Reboot again to change the boot order in the BIOS back to your primary harddisk.

9. Try to startup your computer from your primary hard disk. In case your full system scan has deleted mandatory required files from the operating system, try to restore them from your (hopefully) existing operating system backups. If this is not possible, try to recover them via your operating system installation medium.

10. Try to identify the root cause of the computer virus infection. When the infection was caused by an original vendor CD inform the manufacturer about the found issue. In case the infection was caused by an email attachment inform the sender (of course only if you know him personally!). In case you forwarded that file to others inform them as well.

As stated under 6, when you remove a virus from a computer, you may need to check the virus databases of security software producers. Here are the best known:

For information about emergency boot mediums please check:

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