Besides Spybot and Ad-aware, I suggest that you download, install, update and run other trojan remover tools: a-squared and/or Free AVG Antispyware (trojan removers). Some users recommend SUPERantispyware or Spyware Terminator.

You can use the immunization of [url=http://SpywareBlaster or, which is better, the Windows Advanced Care features of spyware/adware cleaning and removal.

All these programs have free versions.