Use Administrator Account in Vista

This is how you Logon to Administrator account in vista, show vista on logon screen.
1. First you need to run an elevated Command Prompt

To create a shortcut on the desktop/quicklaunch

a. Right-click the desktop, and select New > Shortcut.

b. In the text box of the Create Shortcut dialog box that appears, type cmd and then click Next.

c. On the next screen, type a name for the shortcut -- for example, Elevated Command Prompt. Then click Finish.

d. Right-click on the shortcut you just created and select Properties.

e. Select the Shortcut tab and click the Advanced button.

f. Check the box titled Run as administrator. Click OK and then OK again.

Now drag the icon to your quick launch next to start and click on it to run an elevated Command prompt. (if no quick launch right click taskbar>toolbars>quick launch)

Turning on the Administrator account is easy, first run your elevated cmd prompt.

Then enter this command and press Enter:

Net user administrator /active:yes

From now on, the Administrator account will appear as an option on the Welcome screen.

Now if you want to disable the account and hide it, enter this command at your elevated cmd and press Enter:

Net user administrator /active:no

To set a password on the administrator account type Net user administrator password.