I decided to reload FSX 'Gold' today (some things just work in it!) and all went as per normal until I inserted the Acceleration disc.
Twice it told me I need to install it into an 'English' version of FSX.
Removed FSX, dug out backup 'Gold' package, same bloody result.
This makes absolutely no sense at all, I have two FSX Gold packages and both are the genuine article, both have worked fine previously and all discs are unblemished.
Any ideas would be most welcome!!!