Everytime i try downloading a program on my computer i get this message:

 

C:\WINDOWS\SYSTEM32\AUTOEXEX.NT. The system file is not suitable for running MS-DOS and Microsoft Windows applications. Choose 'Close' to terminate the application.

 

and at the the top it says "16 bit Windows Subsystem"

 

 

What should it do about this

 

Windows XP

 

Dell 4400