Just in case you are using 2.x tables in your VFP app, there is a known problem concerning NT and DOS based xbase tables. There is a Microsoft KB article on this somewhere. Otherwise, look where Craig and Guy have suggested.

>I'm having a problem with VFP applications shutting down when the machine is restarted or shutdown. We are running under NT4 Service Pack 6A. The user will shut down the application and it is removed from the task bar and it also no longer shows in the applications tab of the NT Task Manager. It does continue to show up in the processes tab of the NT Task Manager. When they shutdown or restart, they get the message 'cannot quit visual foxpro'. These systems have a shutdown routine and have also already been closed. This happens approximately 5% of the time. Any ideas are appreciated.
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>TIA!
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>Kris