Spyware Issue

I have this nasty Firefox spyware that opens pop-under ads in IE.  If I just browse in IE, no pop-under.  It only happens in Firefox.  I have both Spybot and Ad-Aware, but neither are picking this thing up.  Sugguestions?  Anyone having similar issues?  Has anyone walked a mile in my shoes and conquered this demon!?  HALP!?

Also, I have the official 4Chan Firefox extension.  Could this be what's causing the trouble?

Thanks, guys.

>>7
Well I am not an "xbox." You have no right to call me that if I made mistakes.  This site should have some rules about harrassments, threats, and name calling.  I am still in the need of more help in that regards