I've tried solving this in the past, never figured it out, then eventually gave up. Now, though, I really need my two computers to talk with each other, so I'm giving it another try. I have a living room PC running Vista and a basement PC running XP. Both are connected properly to a home network. The Vista PC sees the XP on the network diagram and can open and revise files nicely. This is what I need both machines to do. The XP, though, does not show the Vista PC when I diagram the network connections. I cannot bring up any evidence of the Vista's existence from the XP machine. I set-up the network from both PCs a couple of times over. I enabled file sharing on the Vista. I followed three different troubleshooting suggestions within the Vista help file. No luck. I've also tried temporarily disabling the Vista's firewall. Any suggestions? thanks, Jon EDIT: This may or may not be relevant, but I am able to see and print on the basement (XP) printer from the living room (Vista).