Okay, no Critical Errors, hard to believe BTW, not an OS issue with MSCONFIG, no memory issues, no Thermal issues, and BIOS isn't corrupted.
Run Prime95 for at least 2~4 hours in Blend mode. Failure look again for Critical errors listed in the Event Manager.
Look at the SATA run 'Fix It' ->
http://support.microsoft.com/kb/922976 then if the BIOS is set to: AHCI => Start = 0 or IDE => Start = 3 and verified in the registry as shown ->
http://i1013.photobucket.com/albums/af254/Jaquith/AHCI_Start_0.jpg
Otherwise do a full Breadboard with minimal configuration.