I bought it on the Steam Summer Sale and can't get it to run. I'm running 64bit so maybe that has something to do with it. I think I'm going to ask for a refund since the game doesn't work for me.
I'm running a 64 bit system and have no issues. Bummer! Did you get your refund?
I got this during the summer sale as well and I'm really enjoying it. Mouse and keyboard controls really make this easier than when I tried it on the 360.