OK, let's recap.
You've installed Debian, version 3.0.
You're using the kernel that came with Debian, and the modules too.
You've got a pair of crusty old ISA NICs which you've identified.
When you try and load the modules (presumably via modprobe) you get a bunch of "undefined symbol" errors or similar.
Here's an idea, if it's practical - boot the thing off a Knoppix CD and see what that says. Knoppix has substantially better hardware detection than stock Debian, and might give you some clues.
Don't bother with the X version - just do "knoppix 2" at the boot prompt.