The corruption of autoexec.nt is typical spyware damage.
Read this discussion on how it was solved.
Hello. I am having a problem running a DOS program for videotape labels after I have installed Windows XP Service Pack 2. Before the install, I had no problem running this DOS program (Labels Unlimited). I did not need any special setup or to run it under Windows 98 emulation. I have a Dell 8300 3.0 GHZ Pentium 4 processor with 512 RAM.
Now when I run the program, first I get a full black screen with the blinking cursor and my mouse is a typical DOS mouse cursor (grey square that moves around the screen). If I press Alt + Enter I get a window with a title that reads "ntvdm-928.8cc.2f0001"
If I run the program file directly I get another error: C:\Labels\Labels.exe C:\Windows\System32\autoexec.NT The system file is not suitable for running MS-DOS and Microsoft Windows applications. Press 'Close' to terminate the application.
I think it is referring to the fact that a DOS program is not a secure program to run, but I can't believe this is the end of DOS as we know it. Is this the end of DOS? I can still run a command prompt and I can still type CD\Labels but I still get the same error. Any ideas anyone? I would really appreciate any help someone could suggest. Thanks for reading.