16-bit MS-DOS Subsystem<var>path to the program that you are trying to start or install</var>C:\Windows\System32\Autoexec.nt The system file is not suitable for running MS-DOS and Microsoft Windows applications. Choose 'Close' to terminate the application.

This article may help. Also make sure your AV definitions are up-to-date.Error message when you install or start an MS-DOS or 16-bit Windows-based programhttp://support.microsoft.com/?id=324767Regards, Dave Patrick .... Microsoft Certified Professional Microsoft MVP [Windows]