Malwarebytes

Probably the best free Anti-Malware software out today! Coworkers and I have been using this free software for well over a year now and recommend it to anyone that gets Malware on their workstation.  It will scan your hole hard drive or run the quick scan mode for a faster scan of just your critical Windows files. If you have some nasty pop ups or strange software on your computer that you think is Malware, Malwarebytes is for you.

http://www.malwarebytes.org/