For the people struggeling to get knoppix to boot, try: http://btmgr.sourceforge.net/
It's a bootmanager (bootloader?) that is capable of booting from most cd drives, independant from the bios.

(certain disk/drive combinations meight require giving the boot command twice)

Perhaps an option to include it on an easy-reachable directory on knoppix (arrive at non-cd-bootable windows machine, get the tool from knoppix-cd, install it on a floppy/hdd, boot knoppix)