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You should note the search terms it presents you with, before it reboots. See this article for details:
Windows 8 Blue Screen of Death replaces crash details with a sad face
"As you can see in the images above, the uninformative page of text has gone. Instead you get a sad face depicted in text characters followed by a message telling you your PC couldn’t handle a problem.
A reboot is going to happen at this point, but if you want to find out what caused the problem you need to write down or remember the search term it presents you with. The two search terms I have seen suggested so far are “System Service Exception” and “HAL Installation Failed.” I doubt either will return that much useful information as they are both quite generic terms."