I believe that all you Windows 7 users have noticed that the built in Administrator account in this OS is disabled (inactive) by default.
So in this quick guide I’m going to show you the simplest way how to enable (activate) the hidden Administrator account in Windows 7.
1. Go to Computer in Desktop, right-click on it and select Manage. Or the second way is from your Start Menu, by right-clicking on the Computer and selecting Manage.

2. At the left side of the window, go to System Tools then Local Users and Groups and select Users.
3. After entering to the Users are there you will find the Administrator, right-click on it and select Properties.
4. In the Administrator Properties window uncheck the account is disabled in order to make it active.
Now the Administrator Account user in your Windows 7 will be enabled.