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Windupdate Trojan

Error Message: "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."

What's happening is your Autoexec.nt file keeps getting deleted by a file named WINDUPDATE.EXE. Note the spelling it's not WINUPDATE.EXE. Windupdate.exe deletes the Autoexec.nt file after a reboot.

WindUpdate is part of the wind updates ad network. It is installed silently on a user's computer and gives out free advertising to websites that offer the Windupdate ActiveX control. The machines infected with WindUpdates will also receive additional adware applications, and be subjected to popup ads, and other advertising.

Quick Fix

  • 1. Double click on My Computer.
  • 2. Double click on your C drive.
  • 3. Double click on the Windows folder.
  • 4. Double click on the Repair folder.
  • 5. Copy (don't move) the file autoexec.nt by right clicking on the file. A pop-up menu appears. Select Copy.
  • 6. Back out of that folder back to the Windows folder and find the System32 folder.
  • 7. Double click on the System32 folder to open it.
  • 8. Right click on an empty part of the window. A pop-up menu appears again. Select Paste.
  • 9. The autoexec.nt file will appear in the folder
  • 10. Right click on the file itself. A pop-up menu will appear. Select Properties.
  • 11. Check the Read Only box under attributes and click "Apply" and then "OK".
  • 12. Close all open windows.
  • 3. Reboot your system.

    • Removing the Windupdate Trojan

    • You will find the Windupdate.exe file in the \Program Files\Windupdate folder. Delete it!
    • Go to the registry and remove all references to WINDUPDATE.EXE.
      • (Be very careful when editing the registry, critical errors can occur. If you are not comfortable with editing the registry, have someone else do it for you or search the web for an adware/spyware program that is capable of removing this Trojan.)