If you are still having the problem, either you didn't use Mark's program correctly, or there's something else wrong.
For instance, some computers will get a canvas draw error when starting Ore No Ryomi 2. But if you don't post that you're getting a canvas draw error, nobody will know how to solve the problem because you haven't outlined it!
POST YOUR SYSTEM SPECS IN ADDITION TO THE PROBLEM YOU ARE HAVING, AND ALSO POST ANY ERROR MESSAGES! This is the best way to ensure that your problem will be solved.
Also, it's only the GM6 games that don't work with Vista. Older versions, like GM5 (used to make Ore No Ryomi 2 and Helicopter Cacophany 2, for instance), do work on Vista.