Since Knoppix does not write to the disk by default, the type of partition was not an issue, as far as booting is concerned. It does matter if you want to save any data.

My first guess is that you are burning the ISO at high speed, but you might need a cheat code or some help as well. I don't recognize the hardware, could look it up I guess, but you could have just posted the system specs, so I'm not going to try tracking down the information. I suggest that you look at the downloading faq for a pretty detailed list of the issues we have seen new users run up against.