I've had my PC since Nov 2012, I activated Windows way back then. Somewhat recently had a blue screen and then I received a pop up that told me my copy of Windows is not genuine. When I used Activate Windows in the Start Menu it said Windows is Activated.
Followed the steps found on this page
https://support.microsoft.com/en-ca/help/4487266/activation-failures-and-not-genuine-notifications-on-vl-win-7-kms-clie
And it made the problem worse now my background is black and it has a message in the bottom right as well
When it used the shell command "cscript c:\windows\system32\slmgr.vbs /ato"
It returns the Error 0x8007232B DNS name does not exist.