is it possible that someone else is using his computer and viewing stuff? co-worker, family, friend?
if it's him then as far as i can see it's great to help someone stay out of the garbage. but if someone WANTS to stay in the garbage there is precious little we can do. and sometimes there comes a point when we need to do a quick Serenity Prayer and admit that it's not within our power to change it.
just be there for him, if and when he needs it. otherwise just move on. daven for him. but don't obsess about it. it's not your job to shlep him out of the muck if he doesn't want you to do that.
my two cents