There are three peer-to-peer networked computers where I work. Call them A, B, and C. All running WinXP.
We bought a new computer, D, and moved A to replace C. (C is going bye-bye). I followed what I thought was the correct procedure to get the new machine properly networked and the older one properly hooked up in its new physical location, but now when I open My Network Places, from D I can see C and send files to it, read files from it, and print documents on the printer connected to it. But from C I cannot see or access D. C can only see itself and not D or B. Both machines access the Internet just fine.
What is causing this one-way problem, and how do I fix it? The user accounts on both machines are Administrator.
*

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic