In my whole experience with my MSI computer I found it to freeze up when in high intensity graphics such as cities. I did some research and a common suggestion was to NOT overclock. I had no idea how to find that on my MSI system but while looking I found the ability to disable Intel Turboboost in the BIOS. My problem seems completely resolved. Sometimes you just get lucky. Anyway, I found some other posts on the Internet that lead me to think that Flight Simulator does not play well with Intel Turboboost.