Even when you are logged on as an Administrator, when you have User Account Control enabled applications are still run as a standard user and only granted elevated priviledges when required.
To start an application with Administrator credentials follow these steps:
Click Start, in the search box, type in the name of the application, eg "cmd" for a command prompt.
Hold down Ctrl and Shift on your keyboard and press Enter.
You will receive a User Account Control prompt asking you to confirm running this program. Click Allow and the application launches in Administrator Mode.
