Enable the Administrator Account:

1. Open the command prompt with Administrative privileges by opening the Start Menu, and typing cmd in the search box, and then press Ctrl+Shift+Enter or click the Start orb, All Programs, Accessories, right-click Command Prompt and select Run as administrator.
2. Type the following in the command prompt and press Enter after: net user administrator /active:yes
3. Restart your computer and logon as Administrator.
   

Note: You might want to set a password for the administrator’s account for at least a little protection.

Disable the Administrative Account:

To disable the Administrative account run the Net User command demonstrated above while logged on an account with administrative privileges but not as the Administrator account and replace yes with no.