Uninstall the game, then run REGEDIT to remove and keys that have GP4 in it. Reboot, and then try again, remember to run GP4 once beofre patching.
Beta tester for;
Descent 3, C & C Generals, Independance War 2, Starfleet Command 2,
Settlers IV, Tzar, Allegiance, Starfleet Command,
MAX 2, Defiance