Have you scanned with any virus software? Preferably McAfee..and anyways there's been a few topics about this advising people not to click on the links. Go to your processes in your task manager and end anything that looks suspicious..also remember the name of it so you can search for it and delete it if you don't want to use any software. (Also i see this happening alot people complain because it says "access is denied" when you try and delete...so close AIM and anything related to it. Hope that helps
NEVER CLICK .PIF FILES. or any other suspicious ones you don't recgonize.. only trust: jpeg, gif, and .png