I just purchased the game off of Steam and tried to launch it. The Account Registration window that popped up was unresponsive, trying to create an account did not work, nor did registration.
I went to the stardock website and created and account and registered Gal Civ 2 with the steam CD key and it worked so its registered to my account now.
However back on Steam, try to launch type in the info hit register and...nothing. No error, no wrong password just sits there like I did nothing.