That doesnt make a difference, its against the rules to discuss it, and personally I dont care how you or anybody else gets their games.
To Sepho, try updating direct X9. If that doesnt solve the problem then its probably graphic card related. Try updating your drivers.
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VISTA ULTIMATE x64
AMD PHENOM II 940 X4 @3.8GHz
4 GB DDR2
GTX 260 core 216