I bought a second hand G5 Powermac and don't have the administrator's name or password. I went to the used book store and got a retail copy of leopard, 10.5 because it's running leopard, in order to reset the password. I'm trying to follow instructions on line and put the disk in, held down the D key, and now my options are install, optional installations and the instructions which don't tell me how to do it. How do I reset the password without reinstalling and possibly losing my files? Help, please!