We are having Windows 2003 as a domain controller. All Windows XP
professional machines are added to the domain. But from the xp machine i can
view only certain computers in the entire network, and also from server i can
browse or view certain computersin the entire network. Sometimes i receive a
message "The list of workgroup for this server is unavailable. Even though
the computer's are configured to domain.

We may have two issues here. Do you enable and share all computers? On one computer that can not be seen, type net share. What do you receive? For "The list of workgroup for this server is unavailable", I would check the DNS or WINS settings.

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
  We are having Windows 2003 as a domain controller. All Windows XP
  professional machines are added to the domain. But from the xp machine i can
  view only certain computers in the entire network, and also from server i can
  browse or view certain computersin the entire network. Sometimes i receive a
  message "The list of workgroup for this server is unavailable. Even though
  the computer's are configured to domain.

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