ERROR - Access denied. You must be a member of the Administrators group or Backup Operators group to use Windows Server Backup. ...

ERROR - Access denied. You must be a member of the Administrators group or 
Backup Operators group to use Windows Server Backup.  In addition, you must 
run WBADMIN from an elevated command prompt. (To open an elevated command 
prompt, click Start, right-click Command Prompt, and then click Run 
as administrator.)