try adaware from lavasoft

spyware doctor from pc tools

spybot from safer network

eset antivirus, lightest on resourses, fastest scans ive seen, won most virus detection awards, have one with firewall built in(still in beta mode)but works good

hijackthis(one of the best thing to see what is on your pc)

if none of that works reboot and start new(dont forget to backup data)

ive had 1 virus about 2 yrs ago and learn from my mystakes prevention is the key