zone alarm is a miracle worker... best 70 bucks (?) i ever spent.... no program interacts with another unless i say it is ok, no program gets to the internet unless i say it is ok, no file is modified unless i say it is ok...... you get the point
the easiest way would be to download a free firewall, or the free zone alarm one, and when it asks for access deny it.
i agree though, what program is it...?