How to make Windows 7 genuine

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 .. :D

Restart your PC once. Hereafter you won't see the warning message that "Windows 7 is not genuine"