I had problems with adware recently. It was caused by something i had sitting in my PC which stopped it self-updating or installing new updates or working properly.
It could be you have something? Spybot search and Destroy when run in safe mode can clean up pretty much anything dodgy (often stuff that adaware doesnt notice) and the also run in normal mode. If that doesn't work, try running adaware in safe mode, and if that still doesn't work...I'm lost.
There is a really good PC forum called Castle Cops - full of PC nerds who really do know everything...so you could try them! (It's a HUGE forum!)