What do viruses do to computers?

Viruses are software programs, and they can do the same things as any other  programs running on a computer. The actual effect of any particular virus  depends on how it was programmed by the person who wrote the virus.  Some viruses are deliberately designed to damage files or otherwise  interfere with your computer's operation, while others don't do anything but  try to spread themselves around. But even the ones that just spread  themselves are harmful, since they damage files and may cause other problems  in the process of spreading.  Note that viruses can't do any damage to hardware: they won't melt down your  CPU, burn out your hard drive, cause your monitor to explode, etc. Warnings  about viruses that will physically destroy your computer are usually hoaxes,  not legitimate virus warnings.

 Articles From COMPUTER VIRUS FAQ

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