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 Sysclean
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