Here are a few things you could try:
First and formost, make sure there is no firewall software running! XP has built in PFW.Turn off the Internet Connection Firewall ICF in the advanced settings for the Lan Connection. Check for Norton Internet Security AV/Firewall, BlackIce, ZoneAlarm, et al. You will re-enable them after you figure out what is wrong.
Purge the ip and dns info altogether and see what happens.
start...run... ipconfig ...
here are the commands:
/all Display full configuration information
/release Release the IP address for the specified adapter
/renew Renew the IP address for the specified adapter
/flushdns Purge the DNS resolver cache
/registerdns Refresh all DHCP leases and re-register DNS names
/displaydns Display the contents of the DNS resolver cache
Start the Computer Browser Service:
Click Start, right-click My Computer, and then click Manage.
In the console tree, expand Services and Applications.
Click Services.
In the right details pane, verify that the Computer Browser service is started, right-click Computer Browser, and then click Start.
Close the Computer Management window.
make sure all the computers are on the same workgroup
Microsoft uses MSHOME as the default, but most people use WORKGROUP. I know you have probably checked that 100 times, you would not believe how many times I have overlooked that when making changes to a network.
Let us know how this works out... if this doesn't do it... we can try something else.
btw... I have assumed you are using XP PRO.... if not let me know. Also what router/modem do you have?
