"System is not suitable for running MS-DOS..."

[Samfeld]

everytime I try to install something after mounting the ISO image, i get this error box:

16-bit Windows Subsystem

C:\windows\system32\autoexec.nt. The system file is not suitable for running MS-DOS and Microsoft Windows applications. Choose close to terminate, or just ignore

Ignoring does nothing, can someone please help!

[FordPrefect]

Copy "autoexec.nt" from c:\windows\repair\ to c:\windows\system32\
Enable write protecion on c:\windows\system32\autoexec.nt.