Thanks for your help, however, I attempted to load the drivers with Synaptic, but wasn't offered the correct kernel version ... only 2.6.18.45 - which I did install only to get the same results. Spent most of today recovering from a hard drive error of unknown origin, was finally able to recover my partitions and boot the PC. Now, after exhausting all ideas, I cannot even get X to start. I install Nvidia drivers, use nvidia-xconfig ... or edit xorg.conf manually, or use dpkg-reconfigure xserver-xorg ... no difference, screen goes black and freezes. I un-install nvidia drivers, change xorg.conf back, startx screen still goes black and freezes. I restored the xorg.conf file from a previous installation of Knoppix 5.1.1, didn't make any difference. Is there some other file I need to edit or is there a way to completely re-install X?? I don't want to re-install as I have lots of software and files on the drive and it took a long time to get settings tuned properly.
Thanks in advance for any advice.


Update ... I ran the script to determine which glx drivers I needed and the result was: no Nvidia card detected. That may be the source of the problem.