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Q242096: Cannot run System Editor.

Article: Q242096
Product(s): Microsoft Windows NT
Version(s): winnt:4.0
Operating System(s): 
Keyword(s): 
Last Modified: 10-AUG-2001

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The information in this article applies to:

- Microsoft Windows NT Server version 4.0 
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SYMPTOMS
========

When you attempt to run Sysedit.exe from the command line or from the Run dialog
box, nothing may happen.

CAUSE
=====

Sysedit.exe is a 16-bit program. If any of the .dll files listed in the
KnownDLLs value in the following registry key are missing or corrupted, the
Windows NT Virtual DOS Machine (NTVDM), which is required to run 16-bit
programs, does not run properly:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\WOW

The same problem occurs if the Config.nt or Autoexec.nt file is missing or
corrupted, or contains unexpected values.

RESOLUTION
==========

To resolve this issue:

1. Make sure that all of the .dll files listed in the KnownDLLs value in the
  following registry key are uncorrupted and present in either the
  %SystemRoot%\System32 or the %SystemRoot%\System folder:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\WOW

2. To replace any missing files, copy them from a Windows NT 4.0-based computer
  that has a properly working NTVDM to the %SystemRoot%\System32 and
  %SystemRoot%\System folders.

  NOTE: Not all of the .dll files in the list reside in both the System32 folder
  and the System folder, but many do. It does not harm your computer to have
  them duplicated in both folders.

3. If no files are missing, ensure that all the files are uncorrupted by
  replacing them with the same files from a Windows NT 4.0-based computer that
  has a properly working NTVDM.

4. Restart the computer.

MORE INFORMATION
================

The files listed in the KnownDLLs value include:

  Comm.drv
  Commdlg.dll
  Ctl3dv2.dll
  Ddeml.dll
  Keyboard.drv
  Lanman.drv
  Mapi.dll
  Mmsystem.dll
  Mouse.drv
  Netapi.dll
  Olecli.dll
  Olesvr.dll
  Pmspl.dll
  Shell.dll
  Sound.drv
  System.drv
  Toolhelp.dll
  Vga.drv
  Wfwnet.drv
  Win87em.dll
  Winoldap.mod
  Winsock.dll
  Winspool.exe
  Wowdeb.exe
  Timer.drv
  Rasapi16.dll
  Compobj.dll
  Storage.dll
  Ole2.dll
  Ole2disp.dll
  Ole2nls.dll
  Typelib.dll
  Msvideo.dll
  Avifile.dll
  Msacm.dll
  Mciavi.drv
  Mciseq.drv
  Mciwave.drv
  Progman.exe
  Avicap.dll

Additional query words: 16-bit ntvdm wow system

======================================================================
Keywords          :  
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400
Version           : winnt:4.0
Issue type        : kbprb

=============================================================================

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