Badly-behaved 16-bit Application Prevents System Shutdown

SYMPTOMS

A badly-behaved 16-bit application may prevent Windows NT from shutting down cleanly. Once the application misbehaves and you attempt to shut down Windows NT, the shutdown may halt or hang, and it may be necessary to physically turn off the power to the computer to regain use of Windows NT.

After requesting a shutdown, a dialog box with the application's name in the title bar appears stating that the Windows application cannot respond to the end task request. The dialog box presents three choices: Wait, End Task, and Cancel.

If you choose End Task, after a period of time, a similar dialog appears with WOWEXEC in the title bar.

If you select End Task again, the shutdown will never complete, and at this point your computer is unusable:

• CTRL+ALT+DEL has no effect.
• CTRL+ESC has no effect.
• ALT+TAB task switching still works, but is not useful.

The choices available with ALT+TAB at this stage will probably be limited to the bad application and Program Manager. The bad application is still hanging. If you attempt to run other applications from Program Manager, they may fail to start with or without reporting errors. The following errors may appear: At this stage it is necessary to turn off your computer.