Microsoft KB Archive/816743

= Unable to Load Device Driver tcpip.sys =

Article ID: 816743

Article Last Modified on 2/1/2007

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APPLIES TO


 * Microsoft Windows NT 4.0 Service Pack 6a
 * Microsoft Windows 2000 Standard Edition

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SYMPTOMS
After you restart Windows 2000 or Windows NT 4.0, you may get the following popup message: Unable to Load Device Driver : SystemRoot\System32\drivers\tcpip.sys device driver could not be loaded. Also you may see the following error in the system event logs:

Event ID 26 Source: Application Popup Description: System Process - Unable to Load Device Driver : SystemRoot\System32\drivers\tcpip.sys device driver could not be loaded. Error Status was 0xc0000034 event id 26 and Event ID 26 Source: Application Popup Description: System Process - Unable to Load Device Driver : SystemRoot\System32\drivers\afd.sys device driver could not be loaded. Error Status was 0xc0000034 event id 26.



CAUSE
The file TDI.SYS is missing from %systemroot%\system32\drivers folder.



RESOLUTION
Copy TDI.SYS file from the Service Pack CDROM to the %systemroot%\system32\drivers folder.



MORE INFORMATION
Please note that the tdi.sys file is by default protected by the Windows File Protection feature under Windows 2000. Thus when it happens that the tdi.sys file is accidentally deleted, Windows 2000 prompts the administrator for Windows 2000 installation CDROM in order to replace the file. Administrator should not cancel this prompt.

Keywords: KB816743

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