To enable built-in administrator account, read these tutorials:

Quote: Originally Posted by
BisVal
If You do a clean install and make only one account , it will be with full rights.
No, it wont.
The initial user profile created when installing Windows is a normal
Administrator account, the same administrator account type that can be selected when creating a new user profile on
Control Panel > Users.
An example of different level of user rights on two types of administrator accounts: Log in to Windows using your own administrator account. Open Command Prompt, try to run Windows
System File Checker with scan option by giving the following command:
This produces an error message, telling you that only the administrator is allowed to run this command i.e. that you must run this command as
built-in administrator:
To be able to do sfc scan, you must run Command Prompt
elevated (right click
Command Prompt in
Start Menu > Accessories, select
Run as administrator):
An
Elevated Command Prompt has built-in administrator rights. Now when you run the System File Checker command from so called
Administrator Command Prompt with scan option as told above, it runs as planned. See the difference:
A very clear difference between the normal administrator account rights and built-in administrator rights!
Kari