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Microsoft KB Archive/172454

From BetaArchive Wiki

Err Msg: An Error Occurred While Windows Was Working with...


The information in this article applies to:

  • Microsoft Windows 95

IMPORTANT: This article contains information about editing the registry. Before you edit the registry, you should first make a backup copy of the registry files (System.dat and User.dat). Both are hidden files in the Windows folder.


When you open the Sounds tool in Control Panel, you may receive an error message similar to the following message:

An error occurred while windows was working with control panel file C:\windows\system\mmsys.cpl


A registry entry for one of the sound schemes may be damaged.


WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows 95. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

NOTE: For information about how to edit the registry, view the Changing Keys And Values online Help topic in Registry Editor (Regedit.exe). Note that you should make a backup copy of the registry files (System.dat and User.dat) before you edit the registry.

The following registry key lists the programs that have sounds associated with events:


To identify and repair the damaged program registry key, follow these steps:

  1. Click and rename one of the program key folders. For example, click


    and rename it to:


  2. Test to see if you can open the Sounds tool in Control Panel without an error message.
  3. Rename the program key folder to the original name.
  4. If you received an error message in step 3, repeat steps 1-3 for the next program key folder.

When you can open the Sounds tool in Control Panel without the error message, you have found the damaged registry entry. Renaming the program key folder to the original name corrects the damaged registry entry.


This behavior seems to occur most frequently with non-default schemes, and is often associated with a problem during installation of the particular program. The default schemes listed in the registry are: .Default, Explorer, Mplayer, and SndRec32.

Keywords : kbtool kbsound win95 kbenv
Issue type :
Technology : kbWin95search kbWin95

Last Reviewed: December 15, 2000
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