Hey guys, just bought 2011 iMac base model. I installed windows 7 no problems, got steam, fired up a couple games. Theses games are pretty old, no problems jacking up the requirements. I downloaded the bioshock demo via steam and get a black screen with an error message saying that the game caused a crash. I tried to download ATI catalyst, but it keeps saying I do not have the right video adapter. What am I missing? Thanks guys!