Yes you stated he was not very computer literate, however that site is designed for the computer illiterate to follow. If he cant follow the simple instructions on that site then you are not going to be able to control his PC with radmin. The only other advice I could suggest would be to find some website to get ahold of his machine one time, so then YOU could perform the port forward and use radmin from then on. I recall something called Hamachi. Perhaps tech assist, or something similar. Basically a site you direct him to, he is asked to put in a number and then click allow.