Reply to Steam sucks!
If you don't have an account, just leave the password field blank.
Just yesterday my internet was gone, and I wanted to play a game on steam it gave me an option to start in offline mode. When I clicked on it he said something about not finding any user, but at all I couldn't play a game, I mean don't it suck when I want to play a game like Morrowind but I need to be connected to internet?