PopUp Adds - Spyware?
"If a computer is online it can be a target for messenger spam. The ads enter through a loophole in Windows, even if the user is not downloading files from a Web site. Traditional e-mail spam can be ignored, at least until it's time to clear out the in-box. But messenger spam is more aggressive. " - CBC Online - Full Article.
A prime example of spyware, an issue direly in need of attention.