In knoppix, mount his drive (his root partition) somewhere, for example /mnt/hda1
As root do:
Code:
chroot /mnt/hda1
(and assuming his lilo.conf file was OK and all you need to do is write lilo back to the MBR...)
lilo
(or /sbin/lilo if it's not in the path)
The chroot means that the computer behaves as if /mnt/hda1 is /