After cracking Giants: Citizen Kabuto, Multi Player dosn't work.

[ww]

I only bought one copy, and can't afford another one right now., so we cracked the installation of Giants on the other machine with ErrorS crack. Now Multi Player dosn't work anymore. After loading, the game and machine totally freezes. We had to reinstall and now has to switch CD's between the mashines each time we want to play. Any one know of this problem? It would be nice if it could be fixed or I am just doing something wrong.