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Microsoft KB Archive/170569

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Knowledge Base

WinNT Stops Recognizing PCI Network Adapter After It Is Moved to Another PCI Slot

Article ID: 170569

Article Last Modified on 10/31/2006


  • Microsoft Windows NT Workstation 3.51
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 3.51
  • Microsoft Windows NT Server 4.0 Standard Edition

This article was previously published under Q170569


If you move a PCI network adapter from one PCI slot to another without changing its configuration, Windows NT no longer recognizes the adapter.


This occurs due to a problem in PCI cards that cannot detect themselves.


Perform one of the following to work around this problem:

  • Reinstall the driver after the card has been moved.


  • Perform the following steps:

    WARNING: Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.

    1. Start Registry Editor (Regedt32.exe) and go to the following key:

               \<Network Adapter Driver>\Parameters
    2. Modify the bus and slot numbers to the new settings.


Microsoft has confirmed this to be a problem in Windows NT version 3.51 and Windows NT version 4.0 Service Pack 2 and Service Pack 3. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Keywords: kbbug kbenv kbhardware kbnetwork KB170569