You are using Windows Vista, correct?

You should be able to re-boot in safe mode and log in as the built-in
administrator. This account generally doesn't have a password and is only
available in safe mode.

From there, you can get to User Accounts and change passwords.

When your restart your computer, press F8 right before you see the Windows
splash screen. This will bring up the Advanced Boot Options menu, from which
you can select Safe Mode.

- JB

Vista Support FAQ
http://www.jimmah.com/vista/

LOL - So much for "parental controls" ;-)

If you forget the administrator’s password but still can log on
Windows with other user names that have administrative privileges, you
may follow the instructions below:
Right click the computer icon on your desktop, select Manage, find
Local Users and Groups, unfold Users folder, right click Administrator,
click Set password… in the menu comes up. Click Proceed in the
dialog, in the pop-up, enter a New Password and confirm it. Your
administrator’s password is successfully reset.
Guest account may help to log onto Windows, but it has no privilege for
you to do the above to reset the administrator’s password.
If you forgot all user passwords and failed to log onto Windows, there
is no other way but to format the OS and reinstall Windows, or resort to
sort of software tools to remove the password and log onto Windows.
These programs cost some bucks, but are worthy and better than to
reinstall the OS causing consequences. The most popular programs are
Windows Password Reset 6.0 etc. Generally, these programs are easy to
use though turn out to be a scary command prompt to newbie. But do relax
and you can fully manipulate. Let’s take Windows Password Reset
6.0 for example. You prepare a blank CD, burn the program onto the CD,
boot the locked computer from the CD, come to initiate the program,
locate the user name, and proceed to remove its password – all are
at ease.

=?Utf-8?B?ZnJpZGF5?=;54101 Wrote:

If you forget the administrator’s password but still can log on Windows
with other user names that have administrative privileges, you may
follow the instructions below:
Right click the computer icon on your desktop, select Manage, find
Local Users and Groups, unfold Users folder, right click Administrator,
click Set password… in the menu comes up. Click Proceed in the dialog,
in the pop-up, enter a New Password and confirm it. Your administrator’s
password is successfully reset.
Guest account may help to log onto Windows, but it has no privilege for
you to do the above to reset the administrator’s password.
If you forgot all user passwords and failed to log onto Windows, there
is no other way but to format the OS and reinstall Windows, or resort to
sort of software tools to remove the password and log onto Windows.
These programs cost some bucks, but are worthy and better than to
reinstall the OS causing consequences. The most popular programs are
Windows Password Reset 6.0 etc. Generally, these programs are easy to
use though turn out to be a scary command prompt to newbie. But do relax
and you can fully manipulate. Let’s take Windows Password Reset 6.0 for
example. You prepare a blank CD, burn the program onto the CD, boot the
locked computer from the CD, come to initiate the program, locate the
user name, and proceed to remove its password – all are at ease.