Hitman Pro is the best virus remover ever. I don't use it anymore since I have a Mac now but I used it multiple times on my old Windows laptop and it always got the job done.
http://www.surfright.nl/en/hitmanpro/
It has a 30 day free trial. It isn't anti-virus, it's a virus removal tool, so you might want to get anti-virus after using it. It is a lot faster than anti-virus though so you won't be waiting around all day while it scans.