MS server 2003 - client browsing problem

Small school (150) client pcs - they installed server 2003 over the summer. Used to have peer network. I'm a programmer not a network engineer. but am helping with tech at the school. We Have old 120mhz machines with 95 on them, 98s, MEs, and some new machines with xp. Have updated 95s and 98s with AD client software which seems to work. But sporadically any given machine may not be able to browse the entire network. Sometimes (in explorer or from save or open in an aplication) it will work as expected, and unexpectedly it will browse to the Entire Network level or the domain level, and I get a message that there is no domain server connected. This happens even with the new XP machines, so I suspect there is something in the settings I am missing. This was originally setup by a cert Engineer, but something got missed. Please post you thoughts, but at a novice network guys level.
Thanks  - Bob
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Bob LambersonSoftware EngineerAsked:
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apostle12Commented:
These computers, are they part of the domain? Example: teacherspc.school.edu (teacherspc being the name of the pc, school.edu being the name of the domain.) When you go to "active directory users and computers" do you see all 150 pc's?
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apostle12Commented:
It could be an overloaded hub or switch that forces a momentary connection loss. I would assume you guys have quite a few routers?
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Bob LambersonSoftware EngineerAuthor Commented:
Thanks for the responses, apostle12.
Yes, these computers are part of the domain. It's like \\server\domain\pc        I can see all the pcs from active directory users and computers.

We do have a nightmare of cable wiring and many hubs/switches/routers.

The Engineer had us replace several of the hubs with new switches but there are still probably too many. How can I pin this down to explain to the superintendent what is causing the problem?

Bob
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