I have been running across a lot of this lately on several Computers. This is a false program that gives misleading information about security threats to your computer in order to trick you into buying the program. There are several variants of this type of software, however the most common variant I am seeing is AntiVirusXP2008 and 2009. I have found a solution. Its a utility called ComboFix.
Check it out by clicking here.
For more info on this malware click here.