Soldier of Fortune: Cd-key problem...

[tw21]

I recently bought Soldier of fortune, in order to get a legal cd-key, so that I can play online. But I can't manage to find a way to replace the old cd-key I used by the new one!! I uninstalled the game, erased every lefting files, erased some key in my registry base and some Ini files, but when I install, THE GAME ALWAYS FIND THE OLD CD-KEY AND I CAN'T ENTER THE NEW ONE!! I'd like 2 know where this information is stored, in which files...If someone knows the answer...