Open the Run box by pressing Windows and R together When the run box comes, type SLUI4 in it and hit Enter Now an installation Id will appear on-screen with your contact info Now, select your country/region Microsoft will give you a number on-screen Dial that number and enter the installation ID when asked This is a digital Windows license and you have to confirm that you have only used this once Confirm the number through the phone Now they will give you a confirmation ID Click Activate and your Windows 8.1 version is ready to use.