Help anyone!? Newbie 3.6 loading problems

Hi all,
I'm having problems installing knoppix 3.6 I wondered if any of you experts could help me out.
I'm trying on 2 different machines and both seem to be failing on Graphic Card drivers.
My first machine (using Matrox millenium G400 dualhead) boots up fine except that when the screen appears it's unreadable. I can just about make out the penguin! I've tried a few times, adjusting monitor mode and either get the same or
NO SUITABLE X-SERVER found for your card
...the same error as on my other machine (using NVIDIA riva tnt2/tnt2 pro)!!
The help on the disc has a couple of suggestions about entering KNOPPIX XMODULE or fb800X600. Where exactly do I enter these?!!

Any help would be much appreciated.
Cheers,
Adrian

in begining of boot process you see everyting stopping for a fe seconds and the line
boot:
appears, just type knoppix fb800x600 there, or knoppix26 fb800x600
diference being that thew added 26 gives a 2.6 kernel (more current) than the knoppix only.

Thanks. I'm having another go tonight... I may be back!!