Got another one. This guy called him self "XP Antispyware 2012". He tries to look like he is official Microsoft issue, although he isn't. He throws up a window that looks like an anti virus scan and shouts about infections. And he gets into the registry and fixes it so that anytime you run an .exe file, he get run instead.
I'm so glad Microsoft gave us the Registry with the power to reprogram every part of Windows.
Fortunately good old Bleeping Computer had a fix for him.