Adware is considered to go beyond the reasonable advertising that one might expect from freeware or shareware. Typically a separate program that is installed at the same time as a shareware or similar program, Adware will usually continue to generate advertising even when the user is not running the origianlly desired program.
Have you ever downloaded music online?
When you surf online, do you get pop up ads?
Then your computer is most likely infected with Adware!