Problem with multiplayer

[Brian257043]

My friend is having a problem when he and I try to have an online battle. When he clicks Multiplayer on Medieval II or Kingdoms he enters his info, tries logging on, but it says invalid CD key. He Has a CD key (GameSpy), but where is he supposed to enter it.

[AlfonsoVIII]

The CD key was entered when the game was installed, he needs to re-enter the CD key from the registry. Do a search in the registry "Total War" and you should find it.