A virus attaches itself to an existing program such that, when that program is executed, bad things happen. Like a biological virus, it cannot live without a host. In contrast, a worm is an independent program that reproduces itself without requiring a host program. Depending on the form, a worm may be able to propagate without any action on the victim's part. Most malicious software today consists of worms rather than viruses.
Anti-Virus is needed to remove these viruses. On Microsoft Windows, programs in the \WINDOWS\SYSTEM folder are popular virus targets, so a virus scanner will usually check those files. The scanner's internal pattern list can also identify other files that are known to be targets of a particular virus.
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Gokul A Answered on: Jun 16, 2011 at 8:19PM
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