http://pcsupport.about.com/od/windows-8/a/elevated -command-prompt-windows-8.htm

Swipe up to open the Apps screen. If you're using a keyboard, click the arrow icon at the bottom of the screen to open Apps.

Note: Actually, if you're using a mouse and keyboard, there's an even quicker way to open an elevated Command Prompt in Windows 8. See Tip #2 near the bottom of the page for more on that. It works with a touch-only interface too, but it's a little harder that way.

On the Apps screen, locate the Windows System heading. You may need to swipe or scroll to the right depending on the size of your screen.

Press and hold, or right-click, on Command Prompt.

Press or click on Run as administrator from the menu that appears at the bottom of the screen.