Pour ceux que ça pourrait intéresser, la solution est de devenir propriétaire de la clé :
http://forums.microsoft.com/msdn/showpost....1&tf=0&pageid=0
"To edit or delete a protected key, make sure regedit is opened with administrator rights. Select permissions on the key and change ownership from trustedinstaller to an account/group with Administrative rights. Once this change is applied to the key, grant the Administrators - Full Control. The key can now be deleted or changed."
