Hey I have Dual 867 MHz PowerPC G4 with Tiger I believe, I have Leopard on disk but I'm not sure what the outcome will be if I load it. I have a friend that was worried it my clean the computer by erasing all the files and software on the computer. I really want the Leopard but I don't have the Setup files for all my software on this computer and cannot afford to lose it. So I guess my question is, When loading Leopard does it clean or clear the computer? Or will my files and software be safe?