I did what you said but my email and cd key are already in there. I still try to update the registration and get a popup window that says account expired (ref 3).
In the list of games I have already (Galciv 1, Altarian prophecy, GalCiv 2 and sins - they all have my correct email address and cd keys. There is an expiry date tab and they all say none. I guess I could unregister the game as it is an option but then can I re-register with the old key or will I lose the game?