Slow network file/application

[Guest]

I have three new PCs, XP Pro SP2, that have intermittent performance
problems. One has issues if the user logs off and logs back on without
restart or shutdown. One has had problems from the start, other just
started. No consistency as to when it occurs, will work fine then slow
down, to work fine later. Slow internet, e-mail and opening of network
files. If I logged off the PCs I was guaranteeed a performance issue after
logging back in. All three are on a NT Server 4.0 6a domain with DHCP, DNS
and WINS server. The only solution I have found so far is to make the users
a member of the administrators group on the PC. I have contacted Microsoft
support and was told to contact Dell or pay for a solution. Dell told me it
was a network problem so I had to pay for a solution.
Since this is not an acceptable practice I would appreciate solutions.
Thank you.

 

[Guest]

More information please.

How is the Server configured? Both from hardware perspective and from the
viewpoint of NT [include user profiles etc].
What router or switch?
What is the specification of the NIC for Server and each PC and the router
or switch?
What applications are hosted on the server, and how many user licences are
available to each application?
Are the PCs set up log logon to the domain?

SO many things to consider and very little information given by you!

 

[Guest]

This problem does not exist with Windows 9x, NT, or other XP Pro machines.
The PCs and servers have 10/100 NICs, there are two Dell switches between
server and PCs.
Users have a log-on script that maps home, application, file drives upon
log-on to the NT domain.
The user profile is kept locally on XP PC.
It is not a matter of applications and licenses on the server. We have an
ERP package that is hosted by a server otherwise it is file or
internet/e-mail access, which are located on four different servers.

The fact that the user does not have this problem when a member of local PC
administrators group leads me to believe it is PC related not server.

When the user accesses the internet a proxy server is used, when the PC
decides to be slow IE shows looking for proxy versus looking for www.xxx.com.
DNS issue? But why?

Thank you.