sorry to be the one to say this but setting up the nvidia drivers on debian(knoppix) is a pain in the bum hole. It comes down to downloading two packages through apt-get or aptitude or synaptec, whichever you prefer. then its down to reading the included documentation really. basically you are compiling a driver module for the nvidia driver and the glx library. I wish I could be more help but it was a while ago. I'm going to be doing a debian install tonight or tomorrow so maybe i'll write a little tutorial when i do it. good luk til then!