Like the previous poster said, it's a doddle with Win XP.
I now have my kids pcs and my wife's laptop linked to mine on a hub, all sharing a BT broadband modem.
I just ran Network set up wizard on my pc, during the set up you get the option to make a disk which you then run on the other pc's in order to get them set up....simple !
If you want to share files you then have to enable network sharing.