Sorry that didn't help.
As you have seen, Jim doesn't have a Windows 7 machine. And you were supposed to thoroughly test MA3 and see it worked properly, before you paid for it.
We've been told that Prolific supports MA3 on Windows 7, so you can email them.
http://www.serenescreen.com/support/tech.php
When you get a reply, it will be helpful to others if you let us know what they say.