Hey mate,
This is how to enable it:
http://www.eightforums.com/tutorial...rator-account-enable-disable-windows-8-a.html
It is recommended that you use a regular administrative account instead of the built in one, for security. Best practice is to use the standard account and enter the administrator's password only when needed. This prevents most malware from causing more damage than it would have otherwise. See the tutorial for more info on standard account, administrator account, and built in admin account.