What Leopard install disc you're using? OEM or retail one? First is no-go without some tweaks. You should use second one.
OEMRetail
l don't know
Check torrent description then
You clearly got the wrong one, we can't help you with links (That is, If we have them), it is illegal to do so here.
Leopard Restore discs will still be able to boot any Leopard compatiable machine. It's the installer that will refuse to do anything. But you can still use Disk Utility.