Windows 7: Unexpected Shutdown :(

I bought a new comp few days back and i am facing the
'Unexpected Shutdown' issue........
the computer shutdowns only when i run games


Here's the problem:

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: f4
BCP1: 00000003
BCP2: 869F4030
BCP3: 869F419C
BCP4: 82C69D50
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\061911-13837-01.dmp
C:\Users\...\AppData\Local\Temp\WER-23228-0.sysdata.xml

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http://www.sevenforums.com/crashes-d...tructions.html

Regards Sean