When I try to start Knoppix from a live DVD, I get an error during the boot process:

Accessing Knoppix CD /dev/hdb ... insmod: error inserting '/modules/cloop.ko': -1 Bad File Number

When I boot Knoppix from this same DVD on another computer, it works fine. I guess maybe it's looking for knoppix in the wrong drive or something? The computer that works has one DVD-ROM drive, whereas the computer that does not work has a DVD-ROM drive (which the computer won't boot from at all, for some reason) and a DVD-RW/CD-RW drive, which is the one I'm using. What does this error message mean, and how can it be fixed?