I think you've forgotton to install your kernel header files ...
installpkg the kernel-headers file package, for -current it's kernel-headers-2.4.32-i386-1, located in slackware/d.
Equally, there is no reason why you can't reinstall the kernel + modules from the slack disks, and the edit lilo before shutting down. Finally, even with *no* kernel on your root disk, you can boot an installation from disk 1 by passing the argument listed when you boot up the disk. Forgive me, I can't recall the exact line, but it's something like:
Code:
root=/dev/hda1 initro
obviously where hda1 is your root partition.
Good luck,
- Piete.
PS: There are very few things that you cannot fix in a linux install provided you keep boot disks (cd, floppy, memkey etc) handy and a working knowledge of how to use them =)