mahfuznow

1. Open CMD as Administrator

2. Paste the following commands into the Cmd: One by one, follow the order.

 cscript slmgr.vbs /ipk "SERIAL NUMBER HERE"
 
 Replace SERIAL NUMBER HER with any of these, according your Windows 10 installation type.
          Home/Core                            TX9XD-98N7V-6WMQ6-BX7FG-H8Q99        
          Home/Core (Country Specific)         PVMJN-6DFY6-9CCP6-7BKTT-D3WVR  
          Home/Core (Single Language)          7HNRX-D7KGG-3K4RQ-4WPJ4-YTDFH