??? 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!

That's an opinion, not a fact... and if you read the other posts, you'd know its not my child.  Besides, ten years old is too young in most cultures, including mine.  Sorry if you wish you were into porn when you were ten, but the fact remains most children (over 95%, go check off-line research) hadn't seen porn before their teen age years.  So you're telling me 95% of people grow up to be porn-obsessed freaks?  Get off my internet please, you don't meet the intellegent quota for browsing, kthx?