How to resolve Windows Login Error: "An unauthorized change was made to Windows"

After connecting to windows server via RDC, you receive error “An unauthorized change was made to Windows”

Resolution:

1) Click the option that launches an Internet Browser

2) Type: %windir%\system32 into the address field

3) Find the file cmd.exe

4) Right-click on cmd.exe and select Run as Administrator

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

6) Hit the Enter key

7) Reboot

Later,Go to your system options and Update your Windows License Key and also run if any Windows Updates are available.