So, I have one of the original Macbooks. My girlfriend got a new Macbook for Christmas (with Leopard pre-installed, of course). So, I was hoping that I could take her "Mac OS X Install Discs" and install Leopard on my computer since they're both Macbooks. I tried to intall and I get "This software cannot be installed on this computer". I'm assuming that the install disks only work with the computer they came with now? Is there any way around this?