August 10, 2012, 6:59 PM — Here's how you can enable the administrator account in Windows 8.
1. Go to the start screen.
2. Right-click any place.
3. Click the All Apps button.
4. Right-click the Command Prompt.
5. Click the Run As Administrator option.
6. At the command prompt, type in this command then hit Enter:
net user administrator /active:yes
For more, see the original article at the link below.
Log on as Administrator in Windows 8 | Help Desk Geek