if you check your D: drive you should find a folder called KNOPPIX
in that you find a file called mkfloppy.bat, just run that with a empty formatted floppy in A: .
if all went well you should hear the floppy being written to when that stops (may take a while) you can reboot.
Now knoppix should start from that floppy. if it does not work, let us know.
oh, how old is your computer? y PII 233 could boot from CD.