my halo 1 keeps giving me a invalid cd key, i got a new cd key but how do...

[piysta]

...i change my old one without restalin my halo 1 keeps giving me a invalid cd key when i try and join games, my friend gave me his old key, how do i change my key without reinstalling?

 

[pokemadz]

Sorry

The only way to change your cd key is by reinstalling it. Be sure to back up your save files!