John,
Test removing your virus scanner and then test the connection. We have
seen cases where the virus scanner interfered with the clients abolity to
browse the network. Also make sure there is no firewall installed on the
client.
Please look at the following article;
318245 "An Invalid Operation Was Attempted on an Active Network Connection"
http://support.microsoft.com/?id=318245
Larry Stotler, MCSE
Microsoft Product Support
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