The Content Advisor allows one to block certain sites from being viewed, mostly in the interest of Parental Control to keep children away from the more obscure sites like goatse.cx.

It is possible to password protect the Content Advisor configuration, with the sudden possibility of forgetting the password and one need to reset it when not able to remember it.

This can be done in the registry, just delete the value Key which is found at this registry key.

[HKEY_LOCAL_MACHINE \SOFTWARE \Microsoft \Windows \CurrentVersion \Policies \Ratings]
Key=?

After deleting the registry key then go to Control Panel -> Internet Options -> Content-tab -> Settings-button and press the Cancel-button when asked for password. Now the Content Advisor should be disabled.

Note another way to remove the password is to delete/rename the used Content Advisor Profile (A hidden file usually found in Windows\System-folder):

Ratings.pol

After deleting the file then go to Control Panel -> Internet Options -> Content-tab -> press Ok-button. Now the Content Advisor should be disabled. This also seem to work if unable to disable Content Advisor even if one knows the password.

More Info MS KB242037
More Info MS KB310401
More Info Browse the Web with Content Advisor
More Info Description of Content Advisor
More Info Content Advisor in Windows Vista