Here are some good apps for when you think u have a virus but ur not sure or if u just want to kno whats going on, on ur box.
FPORT: Will show u what apps are open and what ports they are using
http://www.foundstone.com/index.htm?...desc/fport.htm
Process Explorer: WIll show u ALL processes running (I FUCKING LOVE THIS SHIT) and will show u what files tehy are using, Pids, etc etc everything
http://www.sysinternals.com/ntw2k/fr.../procexp.shtml