Open an elevated command prompt. To do this, click Start, click All Programs, click Accessories, right-click "Command Prompt", and then click Run as administrator. In Windows 8/10, go to the Start screen. Start typing cmd and Windows will find "Command Prompt". Right click "Command Promp...
To execute this command, you have to run Command Prompt as an administrator. Start the command line as an administrator in Windows by pressing the Win key on your keyboard and typing "Command Prompt" in the search field, then - right-click on the result and select “Run as administrator”...