I've been trying to start playing multiplayer for over a month now! I've registered in both Gamespy and IGN. Neither of of which work when I try to sign in on Medieval Total War II.

I've tried putting in my IGN name and my Gamespy name in the fields to sign in, but it tells me my CD KEY is invalid. What does that mean, and how do I fix it?

The Regedit thing doesn't work either, I don't have an "HKEY_LOCAL_MACHINE/Software/SEGA/Medieval 2: Total War" folder anywhere.