If you think you are infected submit a hijackthis log here.How to submit a hijackthis logDownload Hijackthis
Try running the following from safe mode (Getting to safe-mode
you'll also need the virus template file from here
Also try installing and running A2 Free
I'd also run Spybot
If your using Win2K/XP run adaware/spybot from "safe mode with command prompt"
At the C:\ prompt type the following:-
C:\progra~1\spybot~1\spybotsd.exe /autocheck /autofix