Many commands require that you execute them from an elevated Command Prompt in Windows—in other words, execute them from a Command Prompt that's run as an administrator.
You can always right-click on any Command Prompt shortcut and choose Run as administrator but creating a shortcut to do the same thing can be a huge timesaver if you're a frequent Command Prompt power user.
To complete this Command Prompt trick, just create a Command Prompt shortcut on the desktop, enter the shortcut's properties and then select the Run as administrator box located in the Advanced button on the Shortcut tab.