If you ever need to reinstall your Grub loader, here is how to. If for some reason you need to re install your boot loader GRUB
Boot with your First CD, or your live CD, depending on what you have
Once you have the prompt go with this.
You need to chage hd0 and the hd0,0 for anything your system needs.
hd0 is the first disk on the system
hd0,0 means the first partition of the first disk.