What do computer viruses do?
Some viruses are programmed purposely to damage the data on your computer by corrupting programs, deleting files, or even erasing your entire hard drive! Many viruses do nothing more than display a message or make sounds / verbal comments at a certain time or a programming event after replicating themselves to be picked up by other users one way or another. Other viruses make your computer’s system perform unpredictably or crash frequently.
