I think my son on another computer in my house is accessing adult sites, graphic sites, entering adult chat sessions because he is always on the computer and everytime I walk in the room he shuts off the monitor (not the computer but the monitor) and then when I leave he turns it back on. I am looking for a spy program to monitor what he is going to/doing on this computer. Does anyone know if there is a free (non-destructive) remote spy program that I can download to catch screen images and keylog with?

(Please do not flame because I am NOT looking for a trojan horse program I am looking for a NON-destructive program just to check out what he's up to.)