Try to disable the "Change blending mode if invalide for video card" option,and see if something changes.
Also try to look for the latest drivers for your video card.
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System Specs:
OS: Windows Vista Ultimate x64 Edition CPU: Intel Core 2 Duo E8500 @4GHz
Video Card: MSI GeForce 8800 GTX Motherboard: ASUS Maximus Formula SE
RAM: 4GB OCZ XMS2 PC6400