Microsoft KB Archive/152547

= GP Fault in Windows NT VDM When Using SCROLL_LOCK/UNLOCK =

Article ID: 152547

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Server 3.51

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This article was previously published under Q152547





SYMPTOMS
The following sequence of operations generates a general protection fault (GPF) in the target Windows NT Virtual MS-DOS Machine (VDM) :


 * 1) In ControlPanel, double-click the International icon and change the Keyboard Layout to something other than US (French, German, Spanish, UK, and so forth).
 * 2) Open a Windows NT VDM window.
 * 3) Start a 16-bit application, such as edit file.txt.
 * 4) Press the SCROLL_LOCK/UNLOCK key once or twice.

This generates a GPF in the VDM.

NOTE : the problem does not happen with Keyboard Layout set to US.



RESOLUTION
Upgrade to Windows NT 4.0, or obtain the fix referenced below.

In the absence of side-effects, a solution will be included in Windows NT 3.51 Service Pack 5. The problem is also fixed in Windows NT version 4.0. The file concerned is Ntvdm.exe



STATUS
Microsoft has confirmed this to be a problem in Windows NT version 3.51 Service Packs 1 through 4.

Keywords: KB152547

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