I have the same problem with only one machine.
I have tried separate CD's (two purchased and two created from iso files) for version 3.6, 3.7, 3.9 and 4.02

All version stop with a line that states "cannont find system files" and then some sort of command line prompt.

The computer is currently running Windows ME and has a 450 MHz CPU, 512 Megs RAM. It works great with Windows, but I cannot get any version of Knoppix to work on it. The same CD's work great in 3 other machines that I have.

I can handle, DOS and Windows with above average skills, but I am quite new to Linux and trying to lean.

What command lines or typs can you offer.