Hi Mez12, are you looking for this ?
Login to the disable Administrator using Safe Modehttp://windows.microsoft.com/en-US/windows-vista/Start-your-computer-in-safe-modeIf your computer has a single operating system installed, press and hold the F8 key as your computer restarts. You need to press F8 before the
Windows logo appears. If the
Windows logo appears, you will need to try again by waiting until the
Windows logon prompt appears, and then shutting down and restarting your computer.
Login to the Administrator try to change Your User Account Type to Administrator.
Hope you find the info useful