J´ai trouvé ça dans la FAQ du Punkbuster :
"When I first installed my BF1942 update patch, I chose the option that said "Install PunkBuster Later" but now when I go back to re-run the patch update, it won´t let me install PunkBuster. How do I get PunkBuster installed?
The patch update actually does install PunkBuster when you re-run it and choose "Install PunkBuster Now", the message that says "Patch not installed" at the end is referring to the game patch (since you already installed it), not to PunkBuster. After you re-run the patch update program, you just need to go into the Multiplayer screen and check the PunkBuster checkbox to Enable PunkBuster before trying to join any PunkBuster servers. "
Moi yen na pas tout comprendre de l´anglais...
Mais le truc, c´est que dès que je relance le patch, il m´indique qu´il est déjà installé et me laisse pas du tout le choix de "when you re-run it and choose "Install PunkBuster Now"".
Merci donc de l´aide ;)