it could be the master browser issue. quoted form
http://www.ChicagoTech.net
How do I know I have a browser problem
When you open My Network Places, the computer list you see is obtaining from
the master browser of your network. You have a master browser issue if you
have the following symptoms. 1) If you can ping a computer name, you can
search it, you can map it, but that computer doesn't show or take long time
to show up on My Network Places.
2) Net view command shows no lists or shows "System error 6118 has occurred.
The list of servers for this workgroup is not currently available".
3) when clicking on Computers Near Me in My Network Places or workgroup name
in Entire Network, the following error message may appear: "Cannot Access
'Computers Near Me' " or "Workgroup is not accessible" errors.
4) when click workgroup name under Entire Network Places, you get "Workgroup
is not accessible. You might not have permission to use this network
resource. Contact the administrator of this server to find out if you have
access permission. The list server for this workgroup is not currently
available."
5) Windows Explorer or My Network Places take a long time to open.
6) Event logs on servers show many master browser election messages.
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For more and other information, go to
http://www.ChicagoTech.net
Don't send e-mail or reply to me except you need consulting services.
Posting on MS newsgroup will benefit all readers and you may get more help.
Robert Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN, Anti-Virus, Tips & Troubleshooting on
http://www.ChicagoTech.net
This posting is provided "AS IS" with no warranties.