Maybe but I googled my problem and a lot of people seemed to be having the same problem with other games as well, namely I saw people reporting the same thing on battlenet regarding WoW and Diablo 3.
Mine does the same. Some times I can control alt delete, other times I can't. I can also be just sitting on the desktop doing things and then get a blank screen and that'll be it, reset time.
I'm fairly convinced this is the latest nvidia drivers. Sometimes when I get back to windows I get a msg saying I had a BSOD or that nvidia driver software failed, kernel problem or something.
So don't know what to do. Tried to reinstall a clean version of the previous WQHL drivers from nvidia but it didn't update physx because I had the latest drivers apparently. So I don't know whats going on.