The Service Pack 2 firewall is Crap, if your trusting your Computer to it, your a fool. And even if you had all the Spyware/Malware/Virus Cleaners/Scanners/Blockers that have been released, still doesn't mean one couldn't slip through the cracks.
Is MySpace the only site you have issues with? (you might have said before, but I can't remember)
Possibly a problem with your Flash (or Flash Plugin if your using Opera/FireFox)
EDIT: As for Heat, what makes you say that? BG find out people was doing "bad" things like last time, Lol. Maybe he just wanted it up long enough to tease, or just maybe.............. the CD is gearing to drop! :O Haha, my guess is option A. :\