Windows 7: Error 1000007e Graphic intensive applications

Hello, I'm having problems with running any graphic intensive applications(World Of Warcraft, Skyrim, GoT 1.0.0.0), it Occured once during Windows Memory Diagnostic, and when i tried to flash Windows Expirience Index.
In 3-10 minutes after starting graphic applications laptop fails to blackscreen and on next log message appears.

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 2057

Additional information about the problem:
BCCode: 1000007e
BCP1: FFFFFFFFC0000094
BCP2: FFFFF88004E72F65
BCP3: FFFFF88003ACDFC8
BCP4: FFFFF88003ACD820
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1
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Error message differs from error to error
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Additional information about the problem:
BCCode: 1000007e
BCP1: FFFFFFFFC0000094
BCP2: FFFFF88004CDE99E
BCP3: FFFFF88003ABCED8
BCP4: FFFFF88003ABC730
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1

Thought it's a memory issue, so i tried to remove single sticks (2x2gb) running system on 1 increased working time to 20 minutes or so, but then error occures again.

System info:
Dell Laptop M5010
Windows 7 Home Premium 64bit Service Pack 1

AMD Athlon II p340 dual-core processor 2.20 ghz.
4 Gb ram (2x2)

ST9500325AS ATA

Updated all possible drivers, ran startup diagnostics, passed main test but failed to blackscreen on advanced memory test again.
Running on this installment for 1yr and 2 month or so.

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