Microsoft KB Archive/165953

= PRB: Setup Cannot Register Reg_mfc42.dll in the System Registry =

Article ID: 165953

Article Last Modified on 5/2/2006

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APPLIES TO


 * Microsoft Visual InterDev 1.0 Standard Edition

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This article was previously published under Q165953



SYMPTOMS
During the setup and installation of the Microsoft Visual InterDev 1.0 client, the following error message can be encountered:

"Setup cannot register reg_mfc42.dll in the system registry because an older version is in use. Close all applications and try again."

This error message is referring to the file MFC42.DLL.



CAUSE
This error message can occur even when all applications and tasks are closed. Programs that modify System files for Windows 95 or Windows NT can cause MFC42.DLL to load into memory when Windows loads, causing MFC42.DLL to instantiate before any programs are launched. An example of a program that does this is Norton Utilities for Windows 95/NT. Even when removed from starting, MFC42.DLL is still loaded on startup. An aborted setup from Visual InterDev could also cause this problem.



RESOLUTION
Rename all copies of MFC42.DLL and, if present, MFC42u.DLL and restart your machine. Once your machine has restarted, you may encounter various errors from system files that are attempting to load MFC42.DLL. As long as the Visual InterDev Client Setup is completed successfully, these errors will cease when the machine is restarted.

