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So many post on this problem try and search and see.
Also learn to post your spec. when trying to find a fix.

MSI K9N4 SLI-F nForce 500 SLI Chipset
Intel® Core™ i7-2600K Processor
8GB Corsair XMS PC1600 RAM
2 x NVIDIA GTX590 3GB Video
1TB SATA3 7200 RPM HD

If you have low amount of RAM may be your problem.