As said before: disable Dual Core option.
Specs
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Graphics Card: nVIDIA GeForce GTX 260
Processor:intel i5 2500k 3.3 Ghz@stock
RAM: 8GB DDR 3
Motherboard: Gigabyte Z68 AP3 D3
---------------
Graphics Card: nVIDIA GeForce GTX 260
Processor:intel i5 2500k 3.3 Ghz@stock
RAM: 8GB DDR 3
Motherboard: Gigabyte Z68 AP3 D3