internet connection sharing

Two computers connected to a router and dsl service.
Tried the steps below for both computers.
I cannot enable sharing on either computer.
Going to control panel - add/remove programs - windows
setup - internet tools - details -
When I place a check-mark at internet connection sharing,
click ok, ok and the programs are loaded, then the
internet connecting sharing wizard opens.

Problem - the wizard cannot find the nic or a usb network
device (one computer has a nic the other the usb device,
it only finds the internal modem card. BTW both computers
can access the net successfully.

How can I tell the wizard to use the network device (or do
I let it use the modem and change the 'connection'
somewhere else?) And exactly HOW do I change the
connection setting from the modem to the network device?

If I exit the wizard and restart the computer the check-
mark on the "internet connection sharing" has been
removed, and there is no 'network neighborhood'.

How do I enable the network neighborhood?

I tried sharing using the control panel - network -
client for microsoft networks - file and printer sharing
but that does not enable the 'network neighborhood' either.