Okay, here's what you need to do.
1. Uninstall FDC and delete the FDC folder and any remaining files
2. Reinstall anywhere except into the 'program files' folder... Win 7 regards this as a protected folder and will prevent certain files being installed/accessed/updated, etc. Make a new folder called Aerosoft and install FDC in there.
3. Download and install the latest cumulative updates package from this forum (EVEN THOUGH IT IS THE SAME VERSION). When doing so please ensure you stop all other programs, especially your anti-virus and any other security type programs you might have.
Enjoy