I had lost my FS hard drive a couple months ago. I have since then upgraded to Win10. I installed FSX on a new drive and fired it up. I had been smart and saved my entire USER folder prior to fresh Win10 install. MOST of my programs worked fine after the win10 install using the user folder and data from win7. However, FSX was not one of them. It loaded ok..but kept updating the graphics files every start up. I could load a flight and start up...but usually within 1-3 minutes the graphics went all nuts and the program crashed. I had, back when I ran FSX 3-6 hours most days, tweaked the heck out of the cfg file to get the best possible performance with all my graphics upgrades and scenery upgrades. Long story short (too late).....deleting the old fsx.cfg file fixed my issues... It now runs like it should have right out of the box. Amazing what that little file can do to screw things up...and what an easy fix it is to just delete it.