Halo multiplayer

Hey!

I have a copy of Halo cd. I already installed the crack an I uptadated it without problems. I can also enter to the internet lobby and see the games and servers online. But once I join a server and I´m ready to play a message appears:
"Your Cd key is not valid"

What can I do?
How can I solve the problem?

I'm just guessing but I think you have to dump the no-cd crack, replace the original exe and use the disk.
They want to be sure that your using a legal copy.
If they ask you to take a small download, take it.

halo? good game.. wrong forum buddy.