I have been experiencing problems running FSX on my recent upgrade to Windows 10. The resolution for now to one of my problems was related to this subject so thought it may help someone else in need or hopefully lead to a more permanent or less risky solution....? The below is a link to my post on the Microsoft community site....
http://answers.microsoft.com/en-us/windows/forum/games_windows_10/fsx-crashing-on-windows-10-problems-resolved/7d80c890-5488-49ec-a6bb-e28e21b18f8b?auth=1
Regards.....