disaster with LILO, Debian Linux, Windows, and booting

[Spongebob <NadaSpam@adelphia.net>]

I did something wrong installing a newly-compiled kernel. Unfortunately, I 
forgot to back up /boot, and now I have a mess. I think the map file got 
corrupted.

I now have a system which will either boot windows and nothing else or will 
print an L and halt depending upon which partition I set with lilo -M.

Windows is on /dev/hda1, Linux root is on /dev/hda4. In lilo.conf, 
boot=/dev/hda
root=/dev/hda4

How do I fix this? I'm using Timo's rescue disk to give me access to my 
hard disk. (Using rescue root=/dev/hda4 off the Debian install cd's doesn't 
work for some reason. It gives me an "unable to open initial terminal" 
error and freezes.)

Thank you.