Don't know if anyone else has mentioned it, but at least for test purposes, make sure antivirus is disabled on all machines - not just the server and workstation that's exhibiting the problem.
If that doesn't help:
- check the problem system for ad/spyware
- is there anything different about the problem workstation?
- any possibility of a bad network card or cable?
- any software running that hooks into the file system e.g. Symantec Norton GoBack?
- you could try disabling opportunistic locking on both "server" and the problem workstation:
http://support.microsoft.com/default.aspx?scid=kb;en-us;296264This is obscure, but you never know:
http://support.microsoft.com/default.aspx?scid=kb;en-us;812599&Product=WinXP
Regards. Al
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