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Windows Vista™ Inside Out by Craig Stinson, Carl Siechert, Ed Bott

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Blocking Viruses and Worms with an Antivirus Program

A virus is a computer program that replicates by attaching itself to another object. Viruses can infect program files, documents (in the form of macro viruses), or low-level disk and file-system structures such as the boot sector and partition table. Viruses can run when an infected program file runs; they can also reside in memory and infect files as the user opens, saves, or creates the files. A worm is a stand-alone program that replicates by copying itself from one computer to another, usually over a network or through e-mail attachments. The distinction between viruses and worms can be blurry, and for practical purposes, is unimportant.

Historically, the most common source of widespread ...

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