Here is what you can do.
Download a brand new copy of of XP, and copy your settings for joystick and keyboard to preferences folder, found in in Output folder, and then copy your plugins to the plugin folder.
Make a zip file as backup.
Thereafter download new Scenery to be shore you have the latest. Install them in groups and start with your favours sceneries. then fly, at least 3 times and thereafter install more sceneries.
I have done this, to be shore that not miss any updated sceneries and so fare it works fine, have tried my sceneries who demands for EHAM and ESSA airports, and so fare no crashes when fly. When try to fly with the old version with more sceneries it crash each time.
Sooner or later i will find that a installed scenery course a crash, then I know but still not there.