Hey there.
No, the video card is not the cause of problems. You can reinstall it.
What you really want to do is get rid of that AVG which has caused the stop errors. Here is a special tool to use, to do so in safe mode:
AV Uninstallers - Windows 7 Forums
I recommend installing MSE after since it never causes bsod and is light on resources.
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You'll want to update the video card driver from here:
Code:
nvlddmkm nvlddmkm.sys Tue Jul 14 15:54:48 2009
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You should also install this latest NVIDIA chipset driver package for the motherboard:
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You'll be fine after doing these things. Enjoy.