Download hijackthis from the link below and post the logfile on here. By this I mean, open hijackthis, choose do a system scan and post a logfile on here. By the way, not everything hijackthis shows is bad, so do not check anything on it unless you know what you are doing.
Also, what scans have you ran so far?
There is a point in wisdom and knowledge that when you reach it, you exceed what is considered possible - Jason Schoon