Hi
Okay here's what I understand
First you need to install the kernel headers specific to your distrobution..
>>I determined my current kernel by running cat /proc/version/ My ourput is
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>>Linux version 2.4.20-bf2.4-xfs (root@zombie) (gcc version 3.2.2 20030109 (Debian prerelease)) #1 Don Jan 16 08:25:40 CET 2003
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>>Using Synaptic I downloaded and installed the kernel-headers-2.2.20 package.
Did you install the correct ones I see 2.2 not 2.4?
Secondly, did you install them to /usr/src/linux, If not then made a symbolic link?
Thirdly I'm guessing that you have to compile it or something? so it can make a module image? make menconfig, make-kpkg kernel_image and THEN
make your nvidia-kernel bit
AND THEN
do your make-kpkg modules_image
*shrug* I"m not a Debian User
http://www.linuxquestions.org/questions/
I'd ask the maintainer of the HOW TO guide for pointers too.
Have fun,
Gary