Random BSOD while gaming in Win7 64-bit

Hello, I get random BSOD while gamming any good game. Like 2k11, call of duty and others.

0x0000003B system_service_exception

I have 4 gb of ram
AMD Phenom 9850 Quad- Core Processor 2,50 GHz
Nvidia Geforce 9600GT
SAMSUNG HD753LJ Hard drive
Motherboard M2N68-AM
I run win7 64-bit

I tryed everything: removing rams, unistalling drivers, formating HDD, hit computer with hand ... :) , update BIOS.
 
Is Windows 7 fully updated using Windows Update over and over till no more updates are found? Windows 7 is up to Service Pack 1 now
 
Can you please attach your minidumps for analysis with your next post? You can find them in C:\windows\minidump. Please zip them together (in case of multiple dumps).

Also have you changed anything on this system in recent times, or is it the case where BSODs just started happening out of blue?
 
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