How to switch to administrator Win Vista Ultimate

"There's a tutorial here that tells you how you can do this. Here are the full isntructions for doing this, from mydigitallife.info:

Logon to Windows Vista with normal user account username and password (must belongs to Administrators group).
Click on Vista Start button, and type cmd in the Start Search box.
Right click on the Cmd returned on the search results pane above, then select Run as Administrator.
In the Command Prompt window, type the following text at the command line to set a password for administrator account: net user administrator password. If you want to use a blank password for the Administrator account, skip this step. Replace password with the actual password string that you have chosen. Press Enter when done. Note that if your computer is a member of domain controller or has enabled complex password requirement in Local Security Policy, you will have to pick a really hard to remember password mixed with symbols.
Next type the following command and press Enter to activate and enable Administrator account: net user administrator activate:yes. The process should complete with the following message: The command completed successfully.
Logout from Vista by choosing Log Off or Switch User.
Click on Administrator icon and logon with the password you selected."