para cambiar el orden de boot con windows XP
Cd /boot/grub
vi menu.lst
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,1)
# kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
# initrd /initrd-version.img
#boot=/dev/hda
default=0
timeout=5
splashimage=(hd0,1)/grub/splash.xpm.gz
hiddenmenu
title WIN XP
rootnoverify (hd0,0)
chainloader +1
title Fedora Core (2.6.16-1.2122_FC5)
root (hd0,1)
kernel /vmlinuz-2.6.16-1.2122_FC5 ro root=/dev/VolGroup00/LogVol00 rhgb quiet
initrd /initrd-2.6.16-1.2122_FC5.img