Hey, I've been getting these blue screens lately. I got one yesterday while playing the demo of Supreme Commander 2 (or not while playing it, but I was playing the game when my computer froze and I had to turn it off manually. When I turned it on again it reached the welcome screen, at which point I got the blue screen). After another restart I had no other problems for the rest of the day.
Today I was watching an embedded youtube video when I received another blue screen. After I turned my computer back on it had changed steam to run in Vista compatibility mode for some reason, but everything else was fine.
Other than the blue screens I've been getting my computer freezes quite often so I have to turn it off manually, but I think that might be related to the blue screens. Doesn't seem to happen with any specific actions, as it happens both when I'm just browsing the web (also when I'm not watching videos), and when I'm playing games.
The computer is from February this year, and I'm running the 64 bit version of Windows 7 Home Premium that was installed on the computer when I bought it.