how to fix This copy of windows is not genuine

This copy of windows is not genuine

1.Right click on cmd file and click on Run as Administrator.It is must to run command prompt with administrator privileges. 2. Type SLMGR -REARM (SLMGR is Windows software licensing management tool. REARM command will reset the licensing status of machine) and press enter. 3. Now you will see a confirmation window, click on OK. 4. Restart your PC. Now you will never receive error message. If you see same error message, then try SLMGR /REARM instead SLMGR -REARM. Command SLMGR -REARM works for Windows 32 bit version. It even work for windows 64 bit version. Some times this command will not work for Windows 64 bit version. Then only try SLMGR /REARM instead SLMGR -REARM. After following above procedure, you may remove windows not genuine error. But there is chance that you may have black background. In that case, change the background by going in to system properties. You can also re install OS and follow procedure.