Greg,

Sorry for not replying sooner, I have been away on holiday and still playing catch up, I only just noticed your post.

I have to  say I have had no problems at all with the software, sound works fine and everything appears as it should. I just loaded it straight from the download as it was.

I am running Vista 32 bit and have the UAC settings turned off at all times. I have a friend who also has it and he had no problems either (XP system).
Overall I am very pleased with the product. Yes, you may have to do some editing of the .XML files to get the weapons to originate from the correct positions on your aircraft if you want to, but the SDK explains all the entry points so it's quite straight forward.

I think it adds a whole new dimension to the FSX package.

I am sure you will enjoy it.

Pete