In all these three cases you get the error after booting to the PC, that Windows is not genuine, and also desktop background changed to a black screen. You won’t be able to change the background as you like.
There is also a chance that a Windows update caused this problem. This error occurs because either you are not running a genuine copy of Windows or your license/product key got expired. This Copy of Windows is not genuine” OR “ Windows 7 Not Genuine” is a really annoying issue.
