not sure about the installing to a multi-boot system, so i'll stay out of that.

i guess if it detects two network cards it might be because you have two ?
but also, with one network card, it will show two network 'interfaces' !!
on eis the net address you are using, (192.168.0.1, 10.0.0.1, etc)
the other might be the std 'lo' or loopback address (127.0.0.1)
this is okay.

if you have a generic install to disk, or copy the cd somewhere, i guess you are still in single user cd mode,
but a proper
sudo knoppix-installer
install might be taking over the whole drive.
someone else will point you there too

and if it's not remembering, it points to not being properly installed. like a cd install
after that, i'm a newbie, with my first usable working linux box (redhat, pah) so i try to help.
pardon my english, but i type like this all the time. tehe
44 years old, still joking around , ah, life, can't beat it!