http://forums.contribs.org/index.php?topic=39339.0rpm -qa kernel*
kernel-2.6.9-67.0.1.EL
kernel-smp-2.6.9-67.0.1.EL
kernel-2.6.9-42.0.3.EL
kernel-utils-2.4-13.1.105
kernel-smp-2.6.9-42.0.3.EL
rpm -qa kmod*
kmod-appletalk-1.0-2.2.6.9_67.0.1.EL
kmod-slip-smp-1.0-2.2.6.9_67.0.1.EL
kmod-slip-1.0-2.2.6.9_67.0.1.EL
kmod-ppp-smp-1.0.2-2.2.6.9_67.0.1.EL
kmod-ppp-1.0.2-2.2.6.9_67.0.1.EL
kmod-appletalk-smp-1.0-2.2.6.9_67.0.1.EL
uname -r
2.6.9-67.0.1.ELsmp
Edit /boot/grub/grub.conf and change
default=0
where your first listed kernel is ?