If you are able to stop the machine from rebooting, you ought to be able to get more info on the nature of the problem.
RightClick My Computer > Properties > Advanced > Startup & Recovery and look under "System Failure" and UNCHECK the box to "Automatically Restart."
Be sure any other boxes pertaining to the writing of the reports are checked.
The next time the problem occurs you will get the BSOD - but there ought to be a message and an error code that you can research.
Best Luck :)
PP
PhilliePhan
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