Logon as user and then do any of these:
http://www.sevenforums.com/tutorials/507-built-administrator-account-enable-disable.html
Open a command prompt(Run as Administrator).
Type the following command and enter.
net user administrator /active
Log out and see if you can now log in as Administartor, as well as your existing one.
If not, do it the long way.
Shut down the computer for a cold boot. Tap the "F8" key as you are booting.
Select "
Safe Mode with networking" from the boot menu.
Log into windows 7 with your user account.
Open a command window (START--->RUN--->CMD.exe). At the command prompt type the following (as above)
net user administrator /active
Log out and log back in as administrator.
Another way
Go to Start
Type
Control UserPasswords2. (or Open the Start menu, and type
lusrmgr.msc )
Click
Advanced.
Click
Advanced again.
Select
Users.
Select
Administrator and untick the the box “
Administrator is disabled”
Now log out and login as Administrator.
The action leaves you a little more vulnerable to outside attack. Not a big issue if you are confident with your anti virus control etc.
