I'm not sure where you're running into trouble, but even if you think that you're running as admin, you may not be. If you right click on an icon, and pick "run as Adminstrator", then you know that you have admin privileges. Like if you need to do something using a "Command Prompt" window, instead of just double-clicking on the command prompt window icon, right click and pick "run as Admin", and your command prompt window should be able to do anything.