For everything related to the system in Windows 8 should be run as administrator.
To run CMD or Command as administrator in Windows 8:
• Enter Metro Screen by pressing Windows logo button
• Type CMD (will automatically enter the search menu and will display Command Prompt icon)
• Right click on the Command Prompt icon
To run CMD or Command as administrator in Windows 8:
• Enter Metro Screen by pressing Windows logo button
• Type CMD (will automatically enter the search menu and will display Command Prompt icon)
• Right click on the Command Prompt icon
• Click / select Run as Administrator .