Windows , set up a guest account for him and limit what he can do and change the password on the Admin account so only you can use it.
I have a problematic housemate who will not stop downloading p2p even though we have asked him. It means that the internet is basically unusable and seeing as I am living abroad I need it to communicate with friends and family back home.
The router we have is an Orange Livebox. I have tried blocking ports but it has no effect. I understand it is a bit much to look for a solution like this but talking has not worked.
Is there anything I can do to throttle/limit/stop the downloading?