An interesting thing:
I was in the process of making my computer dual booting w/ win and lin, and for the heck of it, I decided to install a fresh copy of windows XP without installing any virus,adware,spyware,firewall software, this was yesterday. Today, exactly a day later. I ran adaware and x-cleaner. x-cleaner crashed everytime I ran it halfway through the scanning process and adaware said I had 12 ad/spy/bhj. Even as I typed, ad windows would pop up. For some crazy reason, It all happened seemingly when I went to a PS2 cheats site. I'm not sure if this site is the culprit or not, but it made so many popups that explorer crashed!
Just for the record, the site is psx2codes.com/hobbit.html Obviously, I wouldn't suggest going to this site though. Just thought this might be of interest.

peace