are you really trying to block yourself from viewing adult content? if so, then yea you've got a problem.

if you're trying to prohibit someone else from accessing said content, create your own password protected user account with this 'privacy center' disabled, and then log out every time you leave the computer (or lock the computer, it should usually be found in the ctrl+alt+del menu for win2k and later, and requires the same password to unlock the station).

i just recommend the 'alternate-user creation' method because it sounds a heck of a lot easier than banging your head on the wall trying to solve the software problem.