How to Make Windows 7 genuine using Command Prompt

Press Win+ 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..
Done !!!
Now your windows7 won't display 'windows in not genuine ..:D
Restart your PC once. Hereafter you won't see the warning message that "Windows 7 is not genuine"