event viewer threw up this:
The computer has rebooted from a bugcheck. The bugcheck was: 0x0000001e (0x0000000000000000, 0x0000000000000000, 0x0000000000000000, 0x0000000000000000). A dump was saved in: C:\Windows\MEMORY.DMP. Report Id: 071111-14398-01.
Lots of 0s...
I have updated Nvidia drivers to 275.33. I think it has only Blued while I am playing WOW. Dunno if that is pertinant?
Oh and have run memtest, 0 errors.