Content advisor in IE6

You can delete it by browsing to this folder in Regedit (remember to backup your registry first):

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Ratings
Select the icon called Key in the right-hand pane and press delete. Close Regedit.

You can now start Internet Explorer and goto Tools, Internet Options.... Select the Content tab, and click on Disable. When asked for a password, don't enter anything, just click on OK. This will disable Content Advisor, since there's no longer a password. You can enable it again as soon as you think up a more memorable password.