Error Running Program

[Confusion with applicatio]

Hi...I'm really confused.
I'm trying to run a program and get the below message:

It is headed up:
16 Bit MS-DOS Subsystem

The message is:
C:\NEWFOL~1\spill\duke3d\DUKE3D.EXE
C:\WINDOWS\system32\autoexec.nt. The system is not suitable for running MS-DOS and Microsoft Windows applications. Choose 'Close' to terminate the program.

All I have is a 'Close' and 'Ignore' button. Both of which shuts down the application.

I am using Windows XP.

It happens on all MS-DOS applications.
I don't know what I've changed on my pC, they where working before?

Thanks

Marty

[merlin_2]

http://www.jsiinc.com/SUBM/tip6000/rh6042.htm

[johnwill]

You are trying to run a DOS graphics application in a DOS window, which won't work under XP.

[tina]

  im having the same problem i get this error saying 16 bit subsystem not compatible with msdos or windows app please choose to close or ignore can some 1 help me ,,,ty

[sparks  13]

yes me too. does xp cd has those files if it does where should i put them