Maybe this is in the wrong direction, but have you tried logging in as the global Administrator and doing it from there?
Fyi:
There are a three ways:
Open a command prompt(Run as Administrator.)
Type the following command and enter.
net user administrator /active
Log out and see if you have a new alternative login, 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 personal account that holds the (net) administrator access.
Open a command window (START--->RUN--->CMD.exe). At the command prompt type, again, net user administrator /active
Log out and log back in as administrator.
Another way, (maybe quicker in the end!)
Go to Start
Type Control UserPasswords2.
Click Advanced.
Click Advanced again.
Select Users.
Select Administrator and untick the the box “Administrator is disabledâ€
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.
Operating System I own one hi spec laptop, but constantly have four or five different models running in the house.
Computer Type Changing almost daily.
CPU Type and Speed See above
Anti-virus Software Anything currently testing
Computer Skill Level Certified Professional