Enable or Disable default administrator account

In Vista and Windows 7,  administrator account is disabled by default. This account can  be enabled by running the following command from elevated administrator command prompt.

net user administrator /active:yes

See How to open elevated command prompt.

Disable administrator account

net user administrator /active:no

Query the status of administrator account

net user administrator

Using WMIC commands

To enable administrator account:

wmic useraccount where name='administrator' set disabled='false'

To disable administrator account:

wmic useraccount where name='administrator' set disabled='true'

In Windows XP, administrator account is not disabled as in Vista and Windows 7. But we can still use the above commands to disable/re-enable administrator account.