Need help with Norton Rescue Disk problem

I'm trying to create a new set of rescue disks for Norton 2002, and I've encountered a few problems. Initially I was told I'm missing a few files:

mode.com
ega.cpi
keyboard.sys
country.sys
display.sys
keyb.com

I've managed to locate all but one (keyb.com), which is not on my machine.

Two questions:

1. Is it essential? The explanation claims that the "file [is] necessary for your system's startup". The rescue disks appear to work ok, i.e. I tried testing them and the correct options presented themselves.

2. If it is essential, where can I find it?

I have checked the Symantec knowledge base, but can't seem to find a solution.

p.s. Using Windows ME, if that helps.

Thanks.