Modify the restart behavior for the computer. To do this, follow these steps:
- Right-click My Computer, and then click Properties.
- Click Advanced system settings.
- Click the Advanced tab.
- In the Startup and Recovery section, click Settings.
- Click to clear the Automatically restart check box.
This will let you get the BSOD when your computer reboots/shuts down. To check for errors on previous shut downs you can check the system event log:
- Click the Start button .
- In the Search box, type Event Viewer and hit enter
- In the list of results, double-click Event Viewer.
If that is your BSOD error, then it is a video card related error. Try the troubleshooting in this thread: http://www.sevenforums.com/crashes-debugging/181509-bsod-error-nvlddmkm-sys.html