I was trying to install Prepar3d and had it running at one time. But then had problems and tried to reinstall. The problem was I could never completely uninstall. Every time I tried, it wanted to fix the original install, which it could never do.
So I finally gave up and have reinstalled FSX. Thankfully in appears to be running very well. Nearly all of my ORBX scenery has been installed and my most used airplanes.
This started out with some very painful days but is now doing pretty good. There is light at the end of the tunnel....grin
In retrospect there must be someway to totally uninstall Prepar3d but I sure couldn't find it. I deleted every file that had anything to do with Prepar3D but obviously didn't find them all.
At least I am flying again.
Tom