Memory Access Violation

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then get whql certified drivers only (no modded or anything alike) or a graphic chip with less problems.

The 6xxx series is a well known problem series which in most cases borks badly and needed manual prevention algorithms from the dev teams.
NVIDIA broke something on that chip generation.

Simply said, its a power of 2, square only series ie it follows the DX7 specification. If you follow that as well, you won't have problems or at least far less.