how to recover GRUB

PLEASE tell me the appropiate step needed to recover GRUB or LILO..........
AFTER FORMATTING MY WINDOWS TO RECOVER MY REDHAT.

U should be able to boot with fedora cd1 and at the boot prompt enter "linux rescue".

Once booted run:
chroot /mnt/sysimage
/sbin/grub-install /dev/hda

This should put grub back on the mbr.