If you have administrative access to the system, then indeed you can disable the password by tweaking the registry as you saw in some other article.
Use a registry editor, and navigate to:
This is where you find the "UIP" reg_sz entry. It will contain a string of characters that don't make a lot of sense. This information is the encrypted password stored to lock the UI.
You may need to do this in Safe mode, for simplicity sake. I'd rather not go into length of describing a convoluted way to bypass the access protection mechanism.