http://198.199.82.63/AFUS6521/chmx/?p_num=1-877-759-9859
These sites tend to be pretty good sources for numbers. Their content is blocked at my college (thank goodness for firewalls) but the URL has the number. Just delete everything up to the AFUS6521 and it'll spit out one of a few numbers. Through trial and error, I've determined that it's either the 'Pornographic spyware and riskware' popup or the 'Your computer is blocked' Popup. I get success with both.
**1-877-759-9859**
Destroy them.