A few more questions:
When you copy the file locally in order to test whether it will open faster locally than it does over the network, does it hesitate in the same way when you start the copy? Does the copying take place quickly?
Do you have another system with a different OS (Vista, Linux w/SAMBA, etc) that could be used to verify that this behaviour is specific to WinXP and Win2K?
Did you try the idea I posted about using IP instead of system name? Perhaps mapping the drives by \\###.###.###.###\{share_name} would work better, if the issue has to do with name resolution?
If you set up a temporary share on one of the Win2K/WinXP systems and then access it from another, do you get the same results?
What other services are being run from the server. It's acting as PDC, DHCP server, and file server, but is it also the mail server or internet gateway? The more that you have the one system do, the more it'll bog down.
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