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But while the threat of viruses is real, if you educate yourself about them and devise a personal virus strategy, chances are good that your computer will remain healthy and you'll remain happy. Multiply A computer virus is simply a small computer program designed to copy itself over and over and over. Your hard drive and floppy disks are what act as hosts for the infecting viruses, which alter, damage, or delete your files and may even damage the computer's system itself. Unfortunately, one other maddening characteristic of viruses is that they typically try to hide themselves so they can't be discovered and destroyed. Running into Trouble Viruses spread by two kinds of contact by downloading infected files or programs from a network or by inserting infected disks into your computer.