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.

Error message when you install or start an MS-DOS or 16-bit Windows-based program
http://support.microsoft.com/?kbid=324767

Replace the standard version of autoexec.nt/config.nt by copying a backup copy
located in %windir%\repair\ to %windir%\system32\
(NB: %windir% is typically C:\Windows)

Start>Run and type in this without the quotes:
"cmd /c copy /y %windir%\repair\autoexec.nt %windir%\system32"

Troubleshooting MS-DOS-Based Programs in Windows
http://support.microsoft.com/default...b;EN-US;314106

16-bit MS-DOS Subsystem error while installing or running a DOS application:
http://windowsxp.mvps.org/16bit.htm

note:-
Also can be caused by a Trojan installing a file windupdater.exe and
creating registry entries for that file.
http://groups.google.com/groups?selm...g. google.com


"Just kickin it!!!" <Justkickinit@discussions.microsoft.com> wrote in message
news:5EA5DD33-20BC-4CDB-A9E3-11F975B6600E@microsoft.com...
>I am getting an error message when I try to run certain programs that I have
> had no problem running in the past the error is
> C:WINDOWS\SYSTEM32\AUTOEXEC.NT. The system suitable for running MS-DOS and
> Microsoft Windows applications.
> It also has two choices "close" and "ignore" but neither one alows the
> program to launch.
> thanks
>