Blue Screen when starting steam

[Nippe]

I installed Crysis 2 today and played campaign for a while, then someone called me on Skype and when I alt-tabbed back to game my computer bluescreened. After startup I tried to start off Steam, it updated and when it was logging in to Steam my computer bluescreened again.

Now I don't now what I should do to prevent those bluescreens.

Im using 64-bit 7 pro (OEM)

Report added below.

 

[Nippe]

And my pc nearly crashed right after I posted this topic.
I'm pretty sure this isn't steam related issue, I prefer checking this out:
http://www.sevenforums.com/crashes-debugging/129207-bsod-s-again.html