How do I get rid of those *&%$&(* popup windows? A new window will popup every now and then and I have this problem with IE 7 and with Firefox 2. I have Google Toolbar with IE, I've run many anti-adware and antivirus (Avast, Spybot, Ad-Aware to name a few), but none of them have resolved my problem.

Short of reformatting my drive, does someone have a suggestion?

TIA