Basically, a virus is a program that infects a computer by attaching itself to another program.  A computer can become infected by files downloaded over a network, or by the installation of new software or floppy disks that are infected with viruses.

More Information on Viruses
SISD Tech Terms
Webopedia
Whatis?com

The following sites can help you "diagnosis" and possibly "cure" your computer if it has a virus:
McAfee Virus Information Library 
Symantec Virus Center 
Top Ten Viruses 
Hoaxbusters 
 
 
 

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