Viruses suck, my brother downloaded a game that had 2 viruses on it. One was a virus that ways annoying and ghey but kinda easy to get rid of. In AIM, ever time you sent 3 IM's or so many characters, it would delete everything that your trying to send, then insert a hyperlink that says "free porn" and would change the message everytime. The first time i experience it was when i was talking to this hot chick i know but she is one of those extremly religious good girls. Yea not good.
The second one infected ever .exe file on my computer (a little over 8000) and make alot of them not work. Also it made it so you could not instal anything (like new virus protection crap) Finally after about 2 months there was a new online clean on Mcgaffes (sp?)
I have never had problems with porn though.