I'm going to redirect you to the HijackThissection of this forum. This, because it's a deeper infection.
Read this page and follow it's steps: http://www.bleepingcomputer.com/forums/t/34773/preparation-guide-for-use-before-using-malware-removal-tools-and-requesting-help/
Please give them a link to this topic.
I see you have used ComboFix before you came to us. I want to inform you that the execution of ComboFix, without supervision from a trained helper, can have very harmful effects on your computer.
ComboFix is a powerful tool, that can, without supervision from one of us, make your system (partly) corrupt. So I advise you to don't use this tool, and our other tools, in the future anymore without supervision.