Found that recently I was getting my Win7 PC locking up. Found that disabling the Einstein project in BOINC stopped this happening.
Saw others have had same issue on the BOINC messageboard
http://boinc.berkeley.edu/dev/forum_thread.php?id=7713
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Running Einstein can cause Win7 O/S to lockup
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Yes, I know that, happens on some of my systems from time to time. But I control them remote by ultra-vnc with installed video-hook driver. I know how to force that error. But I'm pretty shure this is not your problem.
Did you ever try to read the 'Ereignisprotokoll' (sorry, don't know how an english version calls that)
Windows logs all and everything, but sometimes one can find useful hints, at least, where to start.
https://dl.dropboxusercontent.com/u/50246791/controlpanel-ereignisanzeige.PNG
should be something like controlpanel, system and security, management/administration , eventlog