Tips: How to Enable Hidden Administrator Account in Windows 7

1. From the Command Prompt


You need to run Command Prompt as the administrator. You can do that by right-clicking on Command Prompt in the program list and choose "Run as administrator".  The Command Prompt icon is located un  "All Programs" > "Accessories".

Next, you only need to enter the simple command below to activate the Administrator Account
net user administrator /active:yes

You can also specify your password for this particular account by using the following command
Net user administrator password

That's it, your all finished.  In order to deactivate the Administrator Account, you can use the command below
net user administrator /active:no