Or 1 for that matter!
I'm not quite sure why, I'm not actually getting an error. 1 gives me two windows crash messages without much else, but 2 just doesn't do anything. The process launches and closes itself in under a second, but there's no error or anything, it doesn't even draw a window. I've tried deleting the folders entirely (both are steam copies), redownloading, validating, etc., but I get the same result. Nothing has changed to my knowledge from when they did work and stopped working. I'm on the latest ATI drivers (Radeon 5770, I think), Windows 7, 64 bit.