560Ti Video Hardware Error - Game crashes

[vaios]

Hello guys,
since yesterday I have problems with my (apparently) video card.
Yesterday I tried to play MW2, while after one minute of playing, game crashes, graphics look totally destroyed and I had to open task manager to end the game. I went after restarting to a private match, where it was all strange (letters were green, etc).
The steps I followed.
1. Restart
2. Uninstall Nvidia drivers 275.33 ->Restart
3. Install WDM drivers 270.61
4. Uninstall Steam -> Re-install steam + game

Nothing seemed to help.

Today, I was chilling on my sofa when I saw the screen switching off, restart aero in basic mode, and then all good again. A message appeared:
Video Hardware Error

Description
A problem with your video hardware caused Windows to stop working correctly.

Problem signature
Problem Event Name: LiveKernelEvent
OS Version: 6.1.7601.2.1.0.256.4
Locale ID: 1032

Extra information about the problem
BCCode: 117
BCP1: FFFFFA800C4994E0
BCP2: FFFFF8800F3A5520
BCP3: 0000000000000000
BCP4: 0000000000000000
OS Version: 6_1_7601
Service Pack: 1_0
Product: 256_1
Bucket ID: X64_0x117_Tdr:2_IMAGE_nvlddmkm.sys
Server information: a7dda38f-5065-4f31-9ea7-92d0f28011f6

Hope you guys can point me to the right direction.

System: i5 2500k, asus p8p67 pro, Corsair 8GB Dominator 1600MHz, MSI TwinFrozr 560Ti/OC. W7 x64 SP1

 

[dualsmp]

First I'd run stock clocks and try the 266.58 drivers. If that doesn't work, I'd try to reseat the video card and run memtest on your RAM.

 

[vaios]

First I'd run stock clocks and try the 266.58 drivers. If that doesn't work, I'd try to reseat the video card and run memtest on your RAM.

I have already did memtest and changed the gpu place on motherboard putting it in the second slot.
Ran 3Dmark11, and I noticed some green lines (diagonally on the screen).

Now I just installed W7 on another driver and I m going to test it soon