I don't know whether the win95 & win98 machines have static or dynamic IPs. I'll try what u suggested. What is DHCP? What is Netbui? So, if I manually configure each computer (two win95, one win98, and two new winXP) and their IP addresses and such, then they should all be able to network with eachother, even though win95 and winXP are vastly different? I don't think I made it clear that the win95 machines and the one win98 machine are networking with eachother just fine (it's been in place for a few years). However I need the two new winXP machines to network with AT LEAST the win98 machine without disrupting the network between the win98 and win95. Also, how do you PING another computer? There is no Internet Connection Sharing. Each computer has a 56k dial-up modem (archaic, I know). I think the <B>File & Printer Sharing for Microsoft Networks</B> is installed on each machine because the network has been up for quite a while, we're just adding two new XP's.