Yep. You'll find a file called lilo.conf in /etc

Edit this file. A little ways down you'll see all the images you can boot from (Linux, Linux 2.3 or whatever) and then you'll see your windows partition if you have one, and any other patitions on the disk. Simply delete these blocks and save the file. Now type lilo in konsole and reboot.

On mine i just renamed the ones without OS's one em to Spare Disk.

I suppose you could also toggle 'bootable' in fdisk? Didn't think of that before, but i don't think my spares were toggled bootable in the first place.