Windows not validating valid copy
We highly recommend you to buy genuine windows and do not support any kind of piracy. Once the command prompt is opened now type the following command, SLMGR -REARM , make sure you type the same command without any mistake, and also ensure that command prompt is opened in administrator mode otherwise it will not work. Once you typed the above command in command prompt window then hit Enter button on your keyboard to execute the above command. After you hit enter a confirmation window will appear with the details of command execution as. Now Restart your computer you will not get that error again like Windows 7 build 7600/7601 This copy of windows is not genuine.
To make the procedure safe, you'd better use Ease US free backup software to back up the computer before erasing the update file.
If you have tried entering CD Key again and again or used any software/Patch to crack windows activation but still you get the error like Windows 7 not genuine or, this copy of windows is not genuine build 7600 / 7601, finally you had no luck then this tutorial is for you.
Please note that this is just an educational tutorial for the people who bought original windows and still getting this kind of error or people who want to buy Windows but are not able to buy at this point of time.
Microsoft support only helps you resolve the issue when you buy Windows OS from Microsoft store.
NOTE that the methods given below are used to fix black screen caused by Windows genuine crack copy, it won't help convert a pirate copy of Windows to a genuine one.