I beleive your best chance for a proper response would be to ask for help at the Uru CC forum on the Steam site...click here
i am getting the same message. I have windows 7 64 bit. i'm playing uru cc from cdrom, and i am not sure how to change the compatiblity. i wasn't able to download the patch, altho from what i have read, i shouldn't need to have it at all.
any help would be greatly appreciated