By eHow Computers Editor
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A virus is a program that can copy itself any number of times and infect a computer without permission from the user. A virus may delete files on a computer, format a drive or cause other computer problems. Viruses embedded in email cause billions of dollars in damages every year as these viruses email themselves from one person to another. Earthlink created a state-of-the-art virus blocker to protect its customers. You have to activate the Earthlink mail virus blocker to keep your messages clean all of the time. In emergency situations, Earthlink may activate the mail virus blocker for all users.