I've had this game for about a month, everything was working fine, but when I went to join a server last night I got this error message: Bad Serial Number given in Setup I tried joining different servers, and all of them gave me this error. I checked that everything was up to date, ran steam as admin, and restarted my computer, but nothing worked. Can anyone help me? I really want to keep playing this game :(

Uninstalled both of them, still gives me the same message. Any ideas?