HALO 2 Activation under XP How can I do it?

[xyztrost]

I want to play HALO 2 under XP. I have bought a PC version which is designed for Windows Vista. Then I have used the well know loader to install the game and to play it. It worked so far ok until the level where you have to go to the planet. I believe this is the second level. Before you can enter the level the game is requesting the activation. But I can not start this activation, it does not work under XP.
Does anyone know how to fix it? I have also put the mf.dll in the system32 dir. I have checked what will be change by HALO 2 and this the stuff in the folder C:\WINDOWS\system32\wbem\Repository\FS. The current level position must be also in this dir. Maybe I have to get from someone this folder on a position which is after this level ? I would appreciate a little bit help.