What kernel have you installed? Type "uname -r" to see the version.
Boot up, mount the install CD (it should be number two I guess, I assume you mount it at /mnt/cdrom) and install from /mnt/cdrom/extra/linux-220.127.116.11 (if you get 18.104.22.168 from uname command) or from /mnt/cdrom/testing/packages/linux-2.6.18. You will need the packages called *modules* and optionally *source* from one of these folders. Don't install the *headers* package if you don't know why you need it!!
After this change to /etc/rc.d folder. Make sure that rc.modules is linked to rc.modules-22.214.171.124 (or ...2.6.18..). That's it. Hope I forgot nothing
Edit: Just realized what you wrote about dual processor -- I know there's a kernel with smp enabled. Sorry I don't know about that. If you installed that you would have to take the packages from /mnt/cdrom/extra/linux-smp-126.96.36.199. But only if you installed that kernel. I don't know what happens if you mix packages :-/