I have found the best way to filter all porn or other sites that I do not want my son to see is using McAfee's internet security programs. You are set up as the administrator and you can set the parameters you want for your son and any other members of your family separately. He will not be able to change these unless he knows how to hack into the computer and found out your passwords (I would suggest adding the word "hack" and "hacking" into the list that you can edit for words that you do want allowed when your son does searches on the internet). I first used McAfee's Parental Control software but it did not stop the porn pop-ups. I then downloaded McAfee Internet Security that did stop the pop-ups. When the undesired sites try to connect to your computer, the administrator has to okay them before they are allowed. I was then able to find out where these were coming from and was able to stop them in their tracks. My son doesn't like it because sometimes good sites are blocked and he has to ask me to put in the password, but I would rather he be mad than have that filthy porn coming up even when no one is looking for it. Watch out for the file RapidBlaster on your computer and delete it immediately. It was loaded on without our knowledge through one of these MPG loading site. Good luck!