http://www.rlrouse.com/content-advisor-password.html
Open the registry editing utility. Click
Start, then
Run. In the box, type
regedit and the registry editor will open
Using the navigation tree on the left side of the registry editor window, navigate to this registry key:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\ CurrentVersion\Policies\Ratings]
Click on the key to highlight it, then press the
Delete key. You have just deleted the registry key that contains the content ratings and password.
Click
File, then
Exit to exit the registry editor.
ZH