Castlecops is an excellent site for having qualified folk step-by-step you through a fix. Done this. Can be quite a lengthy process, if things are awry, with lots of infection.
If the learning curve for HJT seems a bit steep, go here
http://www.castlecops.com/f67-Hijack...ans_Oh_My.html to post the log. Read the announcements first, and you may have to go through the clean up procedure, first, also. Really helpful.