A word of caution at the beginning. It is generally not advised to tamper around with the build in administrator account of Windows 7. If you do not need it or do not know why you would need it then don’t. Here is a quick rundown on how to enable or disable the Windows 7 administrator account.
The easiest way to enable or disable the Windows 7 build in administrator account is from the command line. Open a command prompt with administrator rights. This is done by right-clicking on the command prompt icon in the Windows 7 start menu and selecting Run As Administrator from the available options.
To enable the Windows 7 administrator account:
net user administrator /active:yes
To disable the Windows 7 administrator account:
net user administrator /active:no
To change the password of the Windows 7 administrator account:
Net user administrator password
An alternative would be to enable or disable the Windows 7 administrator account using the Local Security Policy option. You can open the Local Security Policy by launching
secpol.msc from the run box.
You find the option under Local Policies-> Security Options. Just change the setting
Accounts: Administrator account by double-clicking the entry.