I have been having the same problem as many others. I cannot delete the ArmA 2 OA folder in Bohemia Interactive Studio (Registry Editor). My key shows as 000000000000000 and I can not change permission settings, I also open registry editor as admin.
I have tried everything and am not sure what to do.
Please help.
http://imageshack.us/photo/my-images/694/nopermission.png/