As I don't run Vista ( supprise supprise
), I don't have a definative answer for this one. I will start by asking if you have already installed other programs and had them work fine without any problems?
This might be a Jim or Edgar question, but we do have some people here on the forum running Vista, so if they don't get back to you with some suggestions after the weekend, then maybe one of our other forum members running Vista can give it a shot and see what response they get.
Don't worry, one way or another we will get you figured out.