WIndows 7 freeze & Bluescreen

Hi there,

i have a serious problem with my new computer..

when i play games like Skyrim, my computer crashes after like 5-10minutes, game freezes, then sound freezes, then he reboots

here my computer secs:

Computer:
Betriebssystem Windows 7 Ultimate Media Center Edition
OS Service Pack -
DirectX 4.09.00.0904 (DirectX 9.0c)


Motherboard:
CPU Typ 4x , 3400 MHz
Motherboard Name Unbekannt
Motherboard Chipsatz Unbekannt
Arbeitsspeicher 8153 MB
BIOS Typ Unbekannt
Anschlüsse (COM und LPT) Communications Port (COM1)

Anzeige:
Grafikkarte GeForce GTX 560
Grafikkarte GeForce GTX 560



here is my dumpfile of the crash:

==================================================
Dump File : 071112-30513-01.dmp
Crash Time : 11.07.2012 00:39:53
Bug Check String :
Bug Check Code : 0x00000116
Parameter 1 : fffffa80`06d5a4e0
Parameter 2 : fffff880`0f1c04d4
Parameter 3 : 00000000`00000000
Parameter 4 : 00000000`00000002
Caused By Driver : dxgkrnl.sys
Caused By Address : dxgkrnl.sys+5d000
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+7f1c0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\071112-30513-01.dmp
Processors Count : 4
Major Version : 15
Minor Version : 7601
Dump File Size : 490.504
==================================================


can anyone help me please?