Microsoft KB Archive/99486

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SYSTEM.INI Setting Needed for MS-DOS Box in Windows

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Q99486

SUMMARY
Sometimes when you are running Windows 3.1 in standard mode on top of LAN Manager and you try to start an MS-DOS box, the screen switches to black, then back to Windows, then displays this dialog box:

The Switch has been Prevented

Cannot Start Application

Exiting Windows and restarting can clear this problem, or you can fix it by finding the NonWindowsApp header of your SYSTEM.INI and inserting the following line:

  TaskSwitchInt6f=OFF Additional query words: 2.00 2.0 2.10 2.1 2.10a 2.1a 2.20 2.2

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