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How can I tell if my computer has a virus?

Since a virus is technically an unwelcome software program that is installed on your computer, the way it affects your computer will vary depending upon the virus program as well as your operating system. In fact, if the virus is very well programmed, you may not notice any signs of infection at all. Furthermore, some of the signs that are commonly associated with a virus infection may actually be caused by something else. Still, some of the signs that are most commonly associated with a virus include:
  • Your computer starts running more slowly than usual
  • Your computer stops responding to you or starts "locking up"
  • You start receiving unusual error messages
In short, your computer simply stops acting normal. To view a more complete list, read "10 Signs Your Computer Has a Virus".
 
 
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Did you know?

A national survey by Harris Interactive for Imation Corp. found that three out of five PC owners (57%) had lost a file that they thought had been sufficiently stored.
85% of PC owners were very concerned about losing data. One in four PC owners said they frequently backed up files, 36% sometimes, 22% seldom and 9% didn't know how to back up files.