Kubuntu Install Problem

I tried to install Kubuntu onto an old machine that had Windows XP on it. I had previously put a newer bigger hard drive into this machine.
When I installed Kubuntu everything went fine until it rebooted and I got a Grub error 18. I discovered that old BIOSs have difficulty booting larger disks so I will have to put the older smaller hard disk back into the machine to install Kubuntu.