If you do, download the new Microsoft AntiSpyware Beta. It found 25 more instances after both Spybot and Ad-Aware said the PC was clean.
I knew it wasn't because it still had a fucking ad server on it SOMEWHERE. I spent an hour going through each system process trying to find which one it was but to no avail.
Downloaded the MS AntiSpy and it was located and gone in about three min.
Definitely worth a look. graemlins/thumb.gif