Redhat 9 boots the old kernel.

[Allan Cardech de Lemos <lemosac tupy ufrrj br>]

I have installed Redhat 9 and let the Redhat Netork Program
update all the packages and stuff. However, when I let it update the
Kernel the update did not take, it still boots the old kernel.

I keep getting this message in the Critial information section of the
updater:
"Your system is currently running kernel-2.4.20-8, but the newest
installed kernel is kernel-2.4.20-28.9. It is recommended that you
reboot at the first opportunity to test this new kernel."
Furthermore, I have booted many times, without result and when I run uname
-a, the answer is: Linux bdados 2.4.20-8 #1 Thu Mar 13 17:54:28 EST 2003
i686 i686 i386 GNU/Linux

Here is my current grub.conf

# 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 (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/md0
#          initrd /initrd-version.img
#boot=/dev/hdb
default=2
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz
title Red Hat Linux (2.4.20-28.9)
        root (hd0,0)
        kernel /vmlinuz-2.4.20-28.9 ro root=/dev/md0
        initrd /initrd-2.4.20-28.9.img
title Red Hat Linux (2.4.20-27.9)
        root (hd0,0)
        kernel /vmlinuz-2.4.20-27.9 ro root=/dev/md0
        initrd /initrd-2.4.20-27.9.img
title Red Hat Linux (2.4.20-24.9)
        root (hd0,0)
        kernel /vmlinuz-2.4.20-24.9 ro root=/dev/md0
        initrd /initrd-2.4.20-24.9.img

It´s possible someone help me!?
Thanks,
Allan Lemos.