??? Help with software for kids and pr0n ??

Sup World4Chan?  I've got a problem, and maybe you guys can help me...
My 10 year old cousin was caught looking at Pr0n on the interbutt, and now I've gotta put some kind of blocks in there, so he can't be looking at it no more... not that there is NEthing wrong with pr0n, but he's a little too young...  We had the talk with him, and although I think that was enough, his parents still want to have more control, so what do you all suggest we use?  The compy is my old one (my first gen system, I'm now on my third), so its running like a p-2 350 on XP, so it can't be anything too heavy for it. 

I've never had to do something like this, so I don't really know what progs to even research... NEhelp would be greatly appreciated...  The things we want it to do is:
Block Pr0n sites
Cashe everything they do
Boot them from compy after they have been on so long (not nessesary, but would be nice)
Create easy to understand reports on demand about what was done while user was on compy

Please, I need assistance here
(Sorry for my bad Engrish... I'm working on it...)

Thanks!

What the hell? I was looking at naked women when I was six. My mom thought that was normal.

What's the big deal? Oh, no! Titties!