How to Enable Administrator Account in Windows 7

As default administrator built in Windows 7 is disabling, you cannot login using this account. If from some reason you need to enable this account follow the step below:
1. Click the Start button go to Control Panel ->Administrative Tools->Computer Management You can see Local user and Group then you can choose administrator then set the password

2. - Click the Start button, and then type cmd in the search box.
    - In the search results list, right-click cmd, and then click Run as Administrator.
    - At the command prompt, type net user administrator /active:yes, and then press ENTER. Type exit, and then press ENTER. Log off the current user account.

By Following the steps, now you can Enable Administrator Account in Windows 7
Good Luck!