This article has been archived. It is offered "as is" and will no longer be updated.
This is a step-by-step troubleshooter for troubleshooting NTVDM or WOWstartup issues. Please note that Sysedit.exe is a 16-bit program availablein Windows NT available for troubleshooting these issues. If it starts up,both the WOW and NTVDM DLLs and executables are okay and you need toconcentrate on the environmental steps below. If SYSEDIT does not start up,try to run only the MS-DOS shell "command.com" from the command prompt.Please note that, if SYSEDIT does not run, all of the steps below apply.
Check the Autoexec.nt and Config.nt for anything unusual or anythingthat can be commented out.
Check for changes in Win.ini or System.ini, or replace by expanding the original files off of the installation media.
The default entries off of the installation disk will allow SYSEDIT to run, but other entries as outlined above may be needed for other applications to run.
Files has a valid range of: files = 5 to 254.
Verify the environment variables by doing either of the following:
Click Start, click Settings, click Control Panel, double-click System, and then click the Environment tab. In Windows 2000, click Settings, click Control Panel, double-click System, click the Advanced tab, and then click Environment Variables.
Run the SET command at the command prompt and check all environmental variables for nulls, blanks, double equal sign (==) marks, or other unknown entries.
Ensure that the path is the same as the default path off of the CD; that is, that there are no entries prepended to the path; if a nonstandardentry is there, remove it.
Check path length for lengths after expansion that are near 200characters. Path is a combination of path in Autoexec.nt and on theEnvironment tab in the System tool of Control Panel. If the path is over100 characters, change it for testing.
Check the following registry entries. The easiest way is to check them out is to see if they are populated first. (There are some cases wherekeys or subkeys just disappear.) Then, if the keys are fully populated,do not try to determine the correct values, just download them and loadon a test system to see if the problem can be reproduced.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\WOW: Parameters for WOW startup
Value: Known DLLs; here is the list of the DLLs, but most are in the list above.
At this point, you may want to try the brute force method: do a parallel installation with all updates and just copy over %SystemRoot%\System and %SystemRoot%\System32 from the parallel installation to the new system.