Rename all the .dll's in it's folder, if there are any, then it shouldn't bother you. Then again, it will complain about being broken.
It is. Net Nanny is much like a virus. Luckily my parents aren't nimrods and don't put security software on my computer (in fact no one touches my computer), but there are always ways to get around things like that.
He has already stated that he uses his own computer.