If you're trying to recover your system,
try the following steps.
Code:
1. boot from your slackware CD
2. when it prompts you for the kernel, do
bare.i root=/dev/<your root partition id> noinitrd ro
where ^----------------------^ this will be
something like hda1
3. once booted, remount root (/) red-writable
mount -o remount,rw /
4. change your root password
5. while there try to run lilo manually, and
tell us the error message? :)
Cheers,
Tink