Windows 7 Ultimate Edition
...
Computer randomly shuts down.
Problem signature
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 1033
Extra information about the problem
BCCode: 50
BCP1: FFFFF88003B30000
BCP2: 0000000000000001
BCP3: FFFFF88011E7D1CE
BCP4: 0000000000000000
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1
Bucket ID: X64_0x50_nvlddmkm!CEvoPushBuffer:

ushCmdDat+12
Server information: 024b4cc7-6eed-4680-860d-d46775fcfde1