Looks like a hardware or driver issue. Video is a good place to start. Have your video drivers been updated lately, i.e., by you or windows update? If by windows update, you could uninstall the update, or System Restore
to a point pre-dating the problem. If this solves the problem, just be sure to change update settings to manual until the driver update reappears so that you can hide that update.
If the drivers haven't
been recently updated, I suggest first unseating and reseating the video card, RAM and other cards (being sure to unplug the machine first and ground yourself (i.e., bare arm against case) against the machine before handling the cards). If the blue screen still occurs, try updating your drivers with mfr's drivers.
If the problem still exists after this, post your blue screen data in the Crashes and Debugging forum
as stated here: http://www.sevenforums.com/crashes-d...tructions.html