A problem when booting with lilo...

I was trying to change some screen resolutions and was changing the lilo config file in the /etc/ directory (I think that's where it was). Somehow when changing some of the boot settings here and in the lilo conf program in system it changed the boot settings to some weird configuration where on the boot menu is DEB 1 DEB 2 and DEB 3, which first completely misses my windows configs and changes the resolutions to 640x480 when I wanted 800x600. Lucky I've got a boot disk so I can get back into Windows.

Is there anyway to completely reinstall lilo or something? Oh, and don't tell me to change resolutions with the Ctrl Alt + - commands as it doesn't properly change the resolutions.