A computer virus is a malware program that, when executed, replicates by inserting copies of itself (possibly modified) into other computer programs, data files, or the boot sector of the hard drive; when this replication succeeds, the affected areas are then said to be "infected".

Learn about computer viruses, including what a virus is, how viruses are spread, and how to help prevent viruses on your own computer with information from ...

A computer virus is very similar. Designed to relentlessly replicate, computer viruses infect your programs and files, alter the way your computer operates or stop it from working altogether. It's estimated that the Conficker virus infected more than 10 million computers in 2009.

A computer virus or a computer worm is a malicious software program that can self-replicate on computers or via computer networks – without you being aware  ...

A computer virus is a program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes.

A computer virus can cause a lot of damage. Find out about worms, computer virus history, origins, and evolution, and how to protect your computer.

In computers, a virus is a program or programming code that replicates by being copied or initiating its copying to another program, computer boot sector or ...

An illustrated guide to the worst viruses in computer history.