|Honestly, could this error be any more helpful?|
Coincidentally, my very next job was also for someone running Windows Vista with a similar problem, though this was with the software for a Brother scanner. Instead of the usual controls for scanning images and files, a white space in the shape of the original program appeared. As before, uninstalling Adobe Flash Player for Internet Explorer did the trick, although the customer did comment that the program looked a bit different than it did before.
I think it's likely that there is a problem with Adobe Flash Player 20 and Windows Vista, or perhaps with Internet Explorer 9, or perhaps with any number of different programs - who knows?