I know it's an old question but it just hasn't been answered before in a way coherent to me.
We have 4 computers under Win 98 hooked peer to peer via a hub. They all function on the network except for one that sees nothing except itself and of course it is not seen by anything else. Just a straight TCP/IP and Client setup over ethernet used everywhere including the bad node. Previously, no troble for three years. Of course, everything seems OK except it doesn't work. I know PCs but networks I know not as well. So I would appreciate a step by step diagnosis procedure.