My son had it on his PC. Here's the program that will get rid of it for good.
Webroot's Spy Sweeper
You can first run a free online scan to find out all the malware you've got.
http://www.webroot.com/services/spyaudit_03.htm
Then download the free trial and its worth every penny to buy it because it will completely protect your system from further crap.
Download the trial here:
http://www.webroot.com/consumer/downloads/