If you’ve recently visited a website or downloaded a program and suddenly your computer has been rebooting itself and crashing or running very slowly, you’re most likely the victim of a computer virus. A computer virus is a software program that can get onto your computer when you download a file that contains the virus. The virus must be removed in order for your computer to run correctly. It can wreak havoc on a computer system and begin destroying files, so the sooner it is taken care of the better. Tips Warnings