Well, to be on the safe side, run HijackThis (HT) click here, & post the resultant log in a dedicated HT forum like click here (instructions before posting click here). They may ask you to run other programs like ComboFix as well.
You can also do a quick HT DIY analysis via click here. Do NOT manually remove anything 'suspect' on your own, but rather ask for help on one of those forums. All the best with it. G
P.S. More HT-related forums at click here (see left column), so you can choose whichever one you fancy