How to Fix "This copy of Windows is not genuine" ?

Method 1 :

C:\Users\USER-PC>slmgr -rearm

Method 2 :

C:\Users\USER-PC>takeown /f "% windir %\System32\slui.exe"
C:\Users\USER-PC>icacls "%windir%\System32\slui.exe" /deny *S-1-1-0:(X)