Microsoft KB Archive/149637

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Last reviewed: April 18, 1996

Article ID: Q149637 The information in this article applies to:
 * Microsoft Windows NT Workstation version 3.51
 * Microsoft Windows NT Server version 3.51

SYMPTOMS
When you run the Windows NT 3.51 Service Pack (1 to 4) UPDATE.EXE, the following error message appears:

An error has occurred. Invalid library procedure: NOTE: A specific library procedure name appears. The procedure name differs each time you run UPDATE.EXE.

CAUSE
This problem occurs if PATCHDLL.DLL is in your path. PATCHDLL.DLL is used during the Service Pack upgrade, but it is removed after the upgrade. The Windows NT 3.51 Service Pack upgrade does not place the file in your path.

RESOLUTION
To correct this problem, rename or remove PATCHDLL.DLL from your path.
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