A more visible target, computer giant Microsoft, for example, might have been taking 10 times that many in the same period, Doll said. And the problem isn't going to lessen, he said. You just stay vigilant. A virus is a sort of global name for rogue programs that invade or infect computers. Viruses can create, erase or damage files.
Worms are types of viruses that generally attack through an e-mail system.
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