[Solved] 0xC004D401 An unauthorized change was made to Windows Server 2008

Windows 2008 is showing errorĀ  “An unauthorized change was made to Windows” and unable to login to Administrator account, it shows “Preparing your desktop”.

Error Code: 0xC004D401

The security processor reported a file mismatch error.

How to solveĀ 0xC004D401 – An unauthorized change was made to Windows Server 2008?

  • Make sure that your have the Antivirus in this system is up-to-date and fully compatible with OS (to latest service pack)
  • Reboot the system.
  • Disable the Antivirus temporarily.
  • Go to %windir%\System32 folder (Normally C:\Windows\System32)
  • Locate cmd.exe
  • Right-click on cmd.exe and select Run as Administrator
  • Enter this command and press enter key.

cscript %windir%\System32\slmgr.vbs /ilc %windir%\System32\licensing\ppdlic\Security-Licensing-SLC-ppdlic.xrm-ms

  • Reboot the computer two times.

 

(NB: Hardboot if you are unable to reboot normally, take all precautions before hardboot)