Okay have tried all driver none worked except 11.6 but this gave me really bad lighting, where lights would shine through wall floors etc. Have reinstalled latest driver and i'm still getting zero frame rate, 11.6 seem to be only drivers that work, running on AMD athlon II X2 250 at 3.00GHz, 4Mb ram and graphics HD5830 tried different options with new patch and still zero frame rate no moddified cfg running or commands to exe. Was really enjoying this game but the lighting is really off putting and will not give me any sort of frame rate with 11.10v2 looking more like a refund for what seem to be an enjoyable game.