Problem:

What does the error "The system file is not suitable" mean?

Resolution:

If you get the following message during installation:

"16-bit MS-DOS Subsystem 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"

There is a well documented problem in Windows XP SP2 that sometimes causes the autoexec.nt file to disappear. When this happens, running 16-bit applications will generate this message. C:\\Windows\\repair should have a backup copy of this file.