Microsoft KB Archive/101266

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16-Bit Windows Environment Stops Responding (Hangs)

Article ID: 101266

Article Last Modified on 11/1/2006


  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Workstation 3.1
  • Microsoft Windows NT Advanced Server 3.1

This article was previously published under Q101266


After a 16-bit Windows-based application generates an exception error and hangs, the rest of the Windows NT operating system also appears to hang. The mouse and keyboard both seem to be disabled.


Normally, the 16-bit Windows environment is protected, running in its own virtual MS-DOS machine (VDM). However, in some cases a 16-bit Windows-based application can appear to hang Windows NT. This can be caused by an application that has enabled journal hooks (a method of recording or monitoring keystrokes and mouse movements). If the application is monitoring journal hooks and then hangs, since the mouse and keyboard are being actively polled by a hung process, they appear to be disabled.


Pressing CTRL+ESC to bring up Task Manager disables journal hooks, frees the mouse and keyboard, and enables you to close the application that caused the problem.

Additional query words: prodnt

Keywords: kbother KB101266