"I ran the up2date software and it showed that there was an updated RH9 kernel that can be installed, so I did, now I have a dual boot startup where I can choose between the old and new kernels. Is there a way around this...?"
You can reconfigure the boot menu by changing your bootloader configuration. If you are using grub this means editing /boot/grub/boot.conf. Here is a grub manual:
If you are using lilo then edit /etc/lilo.conf. After you are through editing lilo.conf then run the lilo command. Here is a lilo HOWTO:
Be prepared. Create a LifeBoat CD.