Parental Control problem!

Hey,
I just got bored with UAC,
so i wanted to disable it, but the problem is that Parental Control isn't letting me to disable it!
look at the video:

http://tinypic.com/player.php?v=1f8ryu&s=3

I try to click on " Turn User Account Control OFF ", but nothing heppened! there is a sign near it and it's written that it's the sign of "Parental Control"
when i go to open Parental Control, it opens for 1 sec and then it go! (look at the video)

Please help!

(i'm using vista ultimate sp1 x86 )