Enable the real hidden Administrator account as follows:
Open a Elevated Command Prompt. Click
Start,
All Programs,
Accessories. Right click on
Command Prompt and select
Run as Administrator.
Enter
net user administrator /active:yes and press
Enter
Type
exit and press
Enter to close the Command Prompt window.
Click
Start then click the Arrow to the right of
Shutdown and select
Logoff.
When the Login screen is shown, is Administrator there? If yes, click on it to login as Administrator (no password).
If not, login as yourself again then do a Restart.
Press F8 during Restart to bring up the
Advanced Boot Options menu. Select
Safe Mode.
Login as Administrator (no password).
Open
Control Panel then
User Accounts.
Click on
Manage another account
Select the account you want to add or remove a password for then click on
Change password or Remove password.