Hello. I have the same problem.
System information:
Windows 7 Ultimate 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_rtm.101119-1850)
System Model: P5K/EPU
Processor: Intel(R) Core(TM)2 Quad CPU Q9400 @ 2.66GHz (4 CPUs), ~2.7GHz
Memory: 4096MB RAM
DirectX Version: DirectX 11
Card name: NVIDIA GeForce GTX 260
