STOP: 0x00000050 (0XC37E0E90, 0x00000000, 0x81CFB778, 0x00000000)
If that was a PAGE_FAULT_IN_NON_PAGED_AREA error, it may mean you've got some memory corruption (not necessarily system RAM--could be video RAM, CPU cache, etc). The exact cause, outside of lots and lots of trial and error, can only really be pinpointed by having an expert examine the memory dumps that windows creates when the error occurs.