Every time I've seen this message, it was due to the .EXE file being corrupted. Have you tried another copy of the CD?

>This is a VFP6 application installation. We've installed this app on windows NT machines before, but suddenly for one client, we are getting a 'not a valid windows NT application' error message running the Setup.exe.
>
>The setup is being run off a CD and there are no spaces in the path or the filename.
>
>Anyone got any idea what I might look for?
>
>Thanks
>
>Alan