Have been setting my son up on an old laptop (hoping screen lasts as it is rather wobbly!) and felt hesitant about spending money on software to avoid the ‘dodgy’ sites when the laptop is ready to die. Was put on to opendns and have been trying it out for a couple of days and it seems to work well. The Salvation Army have used it and have had good reports from them too. You can set it on individual machines or via the router (recommended)……it is so easy to install.