Find SPYBOT Search & Destroy on the Web... it takes care of Hijackers and Adware probs that Ad-Aware doesn't... and Ad-Aware catches all the ones that SPYBOT doesn't...
then do a search for Javacool's Spywareguard and run it aswell, this will prevent most Adware from installing in the first place, cuz it set's their Regkeys making them think that they are already installed...
Ben