What is a Virus A computer virus is a man-made program or piece of code (malware) that is loaded onto a computer without the knowledge of the owner. When the code is executed it can replicate itself by reproducing itself or infecting other programs by modifying them. Viruses are often harmful and perform some type of activity such as filling up hard disk space, over using CPU time, corrupting data, logging keystrokes or dystroying the computer.
How can I remove viruses from my computer?
How can I protect my computer from viruses?