Anti-virus software mostly works the same way. It scans your hard drive for particular signatures that indicate a known computer virus that is contained in the virus definitions supplied by the company. If it finds a sign of a virus, it will typically offer to quarantine or delete the infected file. Quarantining the file will place it in a tightly controlled area by the anti-virus software so that it cannot infect the computer.

Anti-virus programs work best as a line of defense. In some instances, they can repair the damage after infection. In other cases, it cannot. So, what do you do if your computer is already infected by a computer virus?

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