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For a computer application to be called a virus, it must do several things.

Most importantly, it must be able to copy itself into the computer in such a way that the copies can also copy themselves into the computer as well.

After a computer virus is able to spread, the virus programer is able to do other activities depending on his own goals. He might want to have your computer send emails to everyone in your address book. He might want to detect passwords and send the passwords back to himself. He might want to damage the computer in some way by writing damaging code into the operating system or onto the directory of the hard drive.

The most common way that Computer Viruses attack computer programs is by adding the virus code onto the end of the program so that each time the program is run, the virus code is run as well. The original program might be the operating system or some other application.

When the computer is busy running the virus code, it may not run the original program, or it may cause so much activity that the whole computer slows down or crashes.

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12y ago

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