Ok, I did that... I get this error:
/dev/mapper/control: open failed: No such device
Is device-mapper driver missing from kernel?
/dev/mapper/control: open failed: No such device
Is device-mapper driver missing from kernel?
Incompatible libdevmapper 1.00.19-ioctl (2004-07-03)(compat) and kernel driver
Warning: Unable to determine video adapter in use in the present system.
Fatal: open /usr/share/lilo/contrib/debian.bmp: No such file or directory

I think I'm going to push the image of my current XP partition out to hda2 with partimage, and then install knoppix on hda1. Hopefully that will alleviate this issue...