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#11
nstokrnl.exe is reported for a lot of different BSOD errors. Your Error is of the 0x000000c5 type and in my experience is casued the most by a driver.
Update your drivers for your graphics, wireless, lan, sound, motherboard, etc, essentially everything you can to their latest versions and let us know.
Some programs report nsoskrnl as the cause because that was the last in the stack. That is a critical system file, and is highly unlikely to cause a BSOD. Any bugs in that file would be gotten out before the beta builds even.
I believe the cause of your BSOD is hardware. Usually either RAM or CPU.