Not sure if you are still needing help, I followed most of the instructions you received, but had the same issue as you. I finally got it to work. The secret seemed to be comp mode 8, and checking Run: "Maximized". I am running same processor as you, hard drive, and 6 gig nvida card. I also installed sp1 and sp 2, but not the acceleration pack as I could never get the registration to work. With these settings it seems to be working fine (so far) in win 10.
FSX Won't run in Windows 10
in FSX General Discussion
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