lost GRUB GUI after install Winxp !

[ryan robin]

I've used fc3 and winxp. Boot loader (GRUB) was installed on first
sector of /dev/hda3.
fc3 : /dev/hda3 , primary , active partition
win :/dev/hda1 , primary partition
I wanted to install winxp again, so I set active to /dev/hda1 and
installed it. Then, I set active to /dev/hda3 but my GRUB loader has
no GUI ( just the console ) when I boot again. I now can not enter any
OS !
I've tried to boot from FC3 disc1, type 'linux rescue'  and then:
# chroot /mnt/sysimage
# /sbin/grub-install /dev/hda3
Nothing's changed.
Anyone can help me.
TIA.