Let me start from the beginning, as it's quite probable I'm doing something wrong somewhere.
1. After unzipping the main file I get a folder called AGC IWM Duxford FSX which contains a variety of files
2. I launch the main Duxford exe file which starts the auto-installation, but then after going through various screens tells me it can't complete the installation.
3. Same happens with the AI file.
When I tried to follow the "manual-installation" instructions, I was unable to do as recommended as there do not appear to be any sub-folders when you unzip the main (downloaded) file, only the files mentioned above which do not seem to be zip files, so I was unable to really proceed with a manual installation.
Any advice would he much appreciated - especially when I see the fabulous screen shots which were recently published.

Many thanks.








That one solved the problem, which was due to the loader .exe file being unable to create the "Uninstall" file. It did it OK on the desktop, but refused categorically to do it in the "real" FSX directory.
Maybe it has to do with the Vista security system as Hagar said. Good call, thanks again.