Mate,

First of all, welcome to the world of Linux.

It's not always easy, sometimes it is frustrating, but, in my experience, it is always rewarding if you stick with it.

After you type 'sudo knoppix-installer' you get a couple of screens. Press 'Return' untill you are shown a list of your hard drive(s). This will have a description of the drive and some letters, something like 'hda' or 'hdb' with an empty pair of brackets in front. Use the space bar to toggle the selected hard drive. Use the 'up' 'down' keys to move between the drives (if you have more than one).

Press 'return' and this will take you to a programme called 'cfdisk'.

This is similar to the DOS fdisk.

Use the up down keys to move between partitions. Use the left right keys to select a menu option.

basically you want to create enough space on your hard drive to install debian, and you also want a swap partition (the swap partition should be available to store volatile memory to the hard drive, should your RAM get a little short.

Remember that when you do this you will nuke the existing partition; you may want to look at tools that resize your existing partitions if you want to keep them and install Linux on a seperate partition.

Anyway, you nuke the existing partition by moving the up down keys to the partition to be nuked and use the menu (left/right keys) to delete. The select the 'new' menu, select the 'type' menu (83 for linux partition 82 for a swap partition).

Once you're happy select 'write' (no way back now!)

And select 'exit'

(You remembered to make the partition 'bootable', right?)

I think it's a matter of 'follow the instruction' from there on.