This is a particular nasty bit of malware that is floating through the net and it hit me today, I was hit by earlier versions of it also, the 4.51 & the system security 2009 trojans. What this piece of garbage does is, it pretends to be part of your system, showing up in your tool bar using MS symbols, and it pretends to be your security center. It starts telling you that you have all kinds of trojans, virus attacks and so on, while preventing you from activating any of your normal system .exe files to remove it, you can't even get to a restore point if you get this. Every few seconds you click it out, it comes back with more 'warnings' and tells you that you need to 'upgrade' to the 24.99 dollar version of it, or doom will follow. The easiest 'cure' for this trash is Malwarebytes' Anti-Malware, a totally free program you can get off the net. Even if you have it though, this stupid attack will prevent it from running, you have to start your system in safe mode and scan with that, and it will kill it off.