So why should you need a crack for that??? Are you sure that it is not a message like: "enter cd key"???
If you want to join a game you have to enter a valid key first.
It's not possible that some files are missing!!!
Have you patched the game yet??? Newest version is v1.0.9.6
I would download the mp upgrade, too. (it includes 2 new maps)
Why should you change regedit settings??????
