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Microsoft KB Archive/183370

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Knowledge Base

Article ID: 183370

Article Last Modified on 8/15/2007


  • Microsoft Visual Basic 5.0 Learning Edition
  • Microsoft Visual Basic 6.0 Learning Edition
  • Microsoft Visual Basic 5.0 Professional Edition
  • Microsoft Visual Basic 6.0 Professional Edition
  • Microsoft Visual Basic 5.0 Enterprise Edition
  • Microsoft Visual Basic 6.0 Enterprise Edition

This article was previously published under Q183370


When you show the Components dialog by either right-clicking the Toolbox or choosing the Project menu, the following error message appears followed by a blank dialog box:

System Error &H80004002 (-2147467262)
No Such Interface Supported

Note that the memory address may vary.


This error is caused by an incorrect version of comcat.dll.


To resolve the problem, install the correct version of comcat.dll by completing the following steps:

  1. Use REGSVR32.EXE to unregister COMCAT.DLL. REGSVR32.EXE is installed by Visual Basic or it may be found on the Visual Basic installation CD-ROM.

    To unregister, select Run from the Windows Start menu, type the following command line and click Ok:

    regsvr32 /u comcat.dll

  2. Copy comcat.dll, version 4.71 (22k), from the ..\DevStudio\VB\Setupkit\kitfil32\sys32 directory or from your Visual Basic CD to the Windows\System or WinNT\System32 directory.
  3. Use REGSVR32.EXE to register COMCAT.DLL. To register, click Run on the Windows 95 Start menu, type the following command line, and the click OK:

    regsvr32 comcat.dll


This should not be a problem on Windows 2000 because it is a protected system file. Windows 2000 will detect any attempt to rename, delete or replace this file and will put it back as it was.


For additional information, please click the article number below to view the article(in the Microsoft Knowledge Base:

175156 PRB: Class Not Registered Error and Empty Components Dialog

Additional query words: 6K

Keywords: kbpubtypekc kbprb kbregistry kbtophit KB183370