I have 3 XP and 1 Win2000 computers on my home LAN. The problem appears to be that the one computer cannot resolve names to addresses. All computers can ping each others IPAddress. Three computers can ping each other by computer name. One XP computer can not be pinged by name nor can it ping other computers by name. It is not the firewall, I turned that off. It is not a different workgroup name. The "System Properties>Computer Name" tab shows all systems belong to the same workgroup and that no systems are a member of any domain. The DNS Client service is running. The "Administrative Services>Services" program shows the "DNS Client" service startup type as "automatic" and it's status as "started." on all systems. I think the setup is okay. The "Local Area Connection>Properties>Advanced TCP/IP Settings" for the computers are identical. The WINS tab shows no addresses. The "Enable LMHOSTS lookup" checkbox has been enabled. The NETBIOS settings are set to "Default." I have no idea what is wrong. I need help!

did you configure the other pcs firewalls to include the problem pc as "trusted"? or the whole lan subnet [easier]?

you need to either setup a LMHOST for each computer or a WIN's server somewhere? but why don't you just use DNS? why wins? that is your hosts file for DNS

umm all the settings dave- mentioned are defaults, which are fine. He is using dns "The DNS Client service is running" There is no need for a wins server or lmhosts file. You don't even need the hosts file. Ping is what reveals the problem. You have a tcp/ip or firewall issue. Usually its a firewall issue but lets not exclude tcp/ip. Are all the ip addresses in the same subnet? Like 192.168.x.1,2,3,4?

Might be just easier to set ip address's in. For shares use //ipaddress/sharename instead of //netbiosname/sharename. We are kind of assuming you don't have an AD domain. That is where dns would store name for xp but not W2K. "Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10

On that problematic computer, ping other computer by IP and see whether it works. If not, something wrong on your TCP/IP configuration. Just type ipconfig /all and ensure it displays correct IP and other network info. Also you can check this troubleshoot network problem article to help you more.