ACC95: "Unable to Register Mfc40.dll" Error Installing MS Access

ID: Q159685

The information in this article applies to:

SYMPTOMS

When you run Setup for Microsoft Access 7.0 from the stand-alone program disks or from the Office Professional compact disc or floppy disks, you may receive the following error message, and then Setup fails:

Unable to register Mfc40.dll


CAUSE

This error may be caused by mismatched .dll files, by hardware or BIOS conflicts, or by a Windows registry problem.


RESOLUTION

One cause of the error may be a mismatched version of Msvcrt40.dll in the Windows\System or Winnt\System32 folder. A 65 kilobyte (KB) debug version of Msvcrt40.dll ships with Visual C++, ActiveX SDK, and Windows NT version 4.0. Because this file is newer than the one that ships with Microsoft Access 7.0 or Microsoft Office Professional for Windows 95, the Setup program does not overwrite it.

The file installed by Microsoft Access or Microsoft Office Professional is as follows: 


   Msvcrt40.dll     312,832 bytes

The file installed by Visual C++, ActiveX SDK, and Windows NT version 4.0 is as follows: 

   Msvcrt40.dll      65,024 bytes

If you suspect you have the wrong version of Msvcrt40.dll, rename the file on your hard drive and replace it with the correct version from Microsoft Access or Microsoft Office Professional media. Because the Windows 95 or Windows NT 4.0 operating system may be using this file, you may have to do the following in order to replace the file:
  1. Start the computer while holding down the SHIFT key to disable all startup programs.


  2. Rename the existing Msvcrt40.dll file.


  3. Copy the Msvcrt40.dll file from the Microsoft Office Professional compact disc, or use the EXTRACT.EXE utility to extract it from the Microsoft Access disks into the Windows\System or Winnt\System32 folder.


  4. Rerun Setup for Microsoft Access 7.0.


If a mismatched Msvcrt40.dll is not the problem, the only other known workaround is to reinstall Windows 95 or Windows NT in a clean folder, and then install Microsoft Access.



NOTE: Microsoft Money 5.0 installs version 4.1.6038 of MFC40.dll, dated 7/31/96. If this file is deleted or renamed during a Remove All/Reinstall of Microsoft Access 7.0, and Microsoft Money has its Reminder utility enabled, you may receive the following error message when Windows 95 is restarted:
Reminder.exe is linked to missing export MFC40.DLL .5782.

To avoid this error, check the MFC40.dll version number before renaming or deleting MFC40.dll. To fix this error, reinstall Microsoft Money. The older MFC40.dll file will be overwritten by the newer version of Microsoft Money.


REFERENCES

For more information about incorrect versions of Msvcrt40.dll, please see the following articles in the Microsoft Knowledge Base:

Q154591 BUG: Wrong Version of MSVCRT40.DLL (Forwarder DLL) in Windows 95

Q153733 PRB: Wrong Mfc40.dll and Msvcrt40.dll from ActiveX CD-ROM Disc



For information about how to use the EXTRACT.EXE utility to extract files from setup disks, please see the following articles in the Microsoft Knowledge Base:

Q132913 How to Use EXTRACT.EXE to Copy Files from DMF Disks

Additional query words: problem install setup 


Keywords          : kberrmsg kbsetup StpFail 
Version           : 7.0
Platform          : WINDOWS 
Issue type        : kbprb

Last Reviewed: April 19, 1999