I use a filter made by Windows called WIndows Live Family Safety. Google it.
It is brilliant – you can customize it and change it whenever you log in, but you need the password (obviously). I don’t know how much it costs, cos my dads company gave it to me. But you cannot access any other website – on my user, only YWN and DEBKA (Israeli Military News) are available. I cannot click on links, on ads, I cannot do anything that isn’t registered. you can even register GMAIL without Google. And anything i try to do is sent to my Dad’s user with a ‘Request’, and if he enables it, i can go on. There is no way around it.