98SE network reset : desperate case

I have a home LAN with 5 PCs through router through ADSL
modem. Everything work fine exept for one 98SE PC on
which I did a clean reinstall of WIN 98SE (no Windows
update possible as long as I can't get it back on
network, then back online...

I followed exactely all my network configuration (again,
everything else work fine : XP, 95, 98SE machines all
seeing each others, exept this 98se - let's call it BUTCH.

BUTCH was working fine too prior to 98SE reinstall (on
cleaned and reformatted C: drive)

Card : 3Com509B
Router : D-link DI-704P

I followed everything I could find. At the best, BUTCH
saw himself and the other 98SE machine - although it
could not browse on the other 98se. Then, back to see
himself only...

I did exactely the same configuration as the other 98se
machine. I tried another cable, tried another network
wall plug in the house, brought it back directly in the
router downstairs : there's no way apparently I can get
it back on the network, nor to the web (which probably
require it to work on the network first, as every PC go
through the router).

I removed protocols, reinstalled them. I have everything
set :
Client for MS Networks
Network card
TCP/IP configured as required
IPX/SPX
File and Printer Sharing for MS Networks

I tried to ADD NetBEUI and removed it as it did not solve
anything.

I must say that the first setup I did after reinstalling
had a mistake in the third section of IP adress : I had
forgotten that every other PC as well as the Router had
a "0", and I had a "1" so I replaced it, and YES it is
now a "0" (unless you tell me the Register or something
working in some esoteric field may have kept a "1" ???...

Any idea ? This is a desperate case... I was thinking of
starting everything from scratch or even installing Win
XP (this is a PII 350, possibly too slow for it...)

Thanks

Robert L.