Normally you would just run:
and then from within grub:
That is assuming that the partition you want to boot from is the grub equvalent to /dev/hda1. (aka /dev/hda1 = (hd0,0))
After that is done you will have to create a /boot/grub/menu.lst file.
Or you could have searched through this site and gotten THIS
link which would help you.