Computer unexpectedly shut downs

[stevejhones]

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 1033

Additional information about the problem:
BCCode: 50
BCP1: D1158214
BCP2: 00000000
BCP3: 911437AA
BCP4: 00000002
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\100612-26843-01.dmp
C:\Users\User\AppData\Local\Temp\WER-32875-0.sysdata.xml

 

[mi1ez]

Sounds like heat or power supply, when does it happen?