i have the white macbook with 10.5.6 version of leopard. whenever i try to install software updates, it won't install them. it downloads them, but when i restart the computer to install them, it will not do it. i have left it sitting there for over 12 hours before to see if it was just slow, but it didn't help. i would like to avoid messing with apple technicians, can anyone tell me how to fix this myself? i still have all of my leopard disks, in case i need to re-install that. any advice would be greatly appreciated!!