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Chapter 23. Maintaining and Troubleshoot... > Protecting Your System from Viruses ...

Protecting Your System from Viruses with McAfee VirusScan

A computer virus is a program designed to create abnormal behavior on a computer. A virus used to be defined as a "malicious" program. However, some companies are finding useful purposes for programs that are basically viruses, so not all viruses are bad these days. A vast majority still are malicious, though, and some sort of antivirus program should be on every computer.

It's a common belief that viruses come from the Internet—through shareware or freeware programs or email. The fact is, however, that the first viruses created came out before the government allowed public access to the Internet. At that time, viruses sometimes came bundled with software that was bought in stores. Even today, you could go to a store and pick out a program that's wrapped in plastic, and a virus could be on the disk (though it's less common).


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