With Windows Vista you will automatically have the main user (you) and a disabled Administrator account, which is part-used for you to install software, etc. when you're logged in.
But how do you enable this Administrator account so you can really take control of Vista and make it do what you want it to do, no questions asked, here's how...
- Open the Start Menu
- Type cmd to find the Command Prompt, then right-click and Run As Administrator
Net user administrator mypassword Net user administrator /active:yes
(change mypassword for anything you want)
Now log-out and switch over to the Administrator account using the password you picked.