do you have a live cd such as knoppix to report your partition table?
I am guessing its this
hd0,0 = /dev/sda1 = Ms
hd0,1 = extended
hd0,2 = logical = /dev/sda5 = mandriva
hd0,3 =logical = /dev/sda6 = /boot for rh
hd0,4 = logical = /dev/sda6 = / for rh
2) read my tutorial on how to convert to grubspeak
3) if grub is already in mbr you can read my troubleshooter and use commands to boot into mandriva and then using root powers edit the /boot/grub/menu.lst file to something like this
ONLY if it truly boots for you
title ms
root (hd0,0)
makeactive
chainloader +1
title mandriva
root (hd0,2)
kernel /boot/vmlinuz root=/dev/sda5
initrd /boot/initrd.img
title rh
root (hd0,3)
kernel /vmlinuz root=/dev/sda6
initrd /initrd.img
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