you'll need a bootdisk to get you into your linux system. If you didn't make one during instal, you can probably get one from one of RH's ftp sites. Once you get into linux, open up a console as root, and type
me@localhost# grub
you'll get a grub command prompt:
grub> root (hd1,0) /*or wherever your boot partition is - (hd1,0) = /dev/hdb1 */
grub> setup (hd0)
grub> quit
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