With the invention of Microsoft’s UAC (User Account Control), users were no longer Administrator. At least, not the full blown administrator. Windows now operates on the more secure least needed privledges. If you’d like to enable the built-in Administrator account, which is hidden by default, follow these few easy steps.
1. Open a Command prompt. You can go to Start and type CMD and press enter.
2. Type net user administrator /active:yes.
3. This will activate your Administrator account. To verify that it has indeed done just that, go to the Control Panel > User Accounts. You should see the Administrator account enabled and ready for use.