How to enable the build-in Administrator account in Windows Vista
Follow the instructions to enable the build-in Administrator account in Windows Vista:
Click ‘Start’, and then type ‘cmd’ in the ‘Start’ Search box.
In the search results list, right-click Command Prompt, and then click “Run as Administrator”.
When you are prompted by User Account Control, click ‘Continue’.
At the command prompt, type net user administrator /active:’yes,’ and then press ‘ENTER’.
Type net user administrator, and then press ‘ENTER’.
Type ‘exit’, and then press ‘ENTER’.
Log off the current user account.
It may be useful to enable built-in Administrator account in Windows Vista to do some automation work without UAC elevation prompt.