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The issue is mostly explained in the title, however here's some more information:

This has happened several times, and I have never personally watched it happen. I've only seen it show up in the Event Viewer when I return to my PC being at the login screen.

This PC runs 24/7 for the most part, and the power supply is an 850w ABS from 2010.

Here are my temps and volts currently as reported by HWmonitor:

enter image description here

I am running Zune, iTunes, Chrome, Firefox, Visual Studio 2012 and Steam, so the CPU is under some load, 5-20%, but nothing significant.

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check this: support.microsoft.com/kb/2028504 –  magicandre1981 Apr 12 '13 at 4:07
I would see if a fresh Windows 8 installation allows this to still happen. If it does then its a hardware problem. –  Ramhound Apr 12 '13 at 11:38

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