I'm interested in seeing it. I doubt I'll buy it since its not a full world simulator but I might change my mind when i see it. If I understand Dovetail's public comments correctly, they do intend on releasing a full simulation by years end that will be 64 bit.
I have the Disc version (Gold edition) so I can't comment on the Steam version. I doubt that a messy installation of FSX would be the cause of his OS problems. A full reinstall of FSX and all the addons can take quite a while.