So now i'm going to show you a easy way to make your windows 7 genuine using command prompt.
How to make Windows 7 genuine using Command Prompt
Press Windows key + R
Now "run" box will appear , in "run" box type CMD
Click on OK
Note : Run CMD as Administrator
Now command prompt will appear
In command prompt type SLMGR -REARM
Hit Enter.
Wait 5-10 seconds
Now a message will appear as shown in image below.
Done !!!
Now your Windows 7 is genuine
Restart your PC once. Hereafter you won't see the warning message that "Windows 7 is not genuine"