Jammerjonn,
Thank you for your reply. I got FSX to run fairly reliably in Windows 8.1 by installing it in the root directory, running as Administrator and compatibility to Windows 7. I have now installed Windows 10 and find performance to be very reliable there. I have a ton of addons installed and all work just fine. I recommend Windows 10. I am having a minor problem with the sound with my Realtech High Definition when in cockpit mode. It has some static it is a minor irritant.