Hi I was having issues with running fsx on windows 8.1 in the grafics department. Trying to fly and seeing video artifacts especial taking off from an airport is annoying. My system is really not that powerful but I am able to use fsx what I did find is when I shut down the dx10 it works fine now visuals might not be as good but I am able to take off with no video artifacts..i am running on a I5 6gig of ram a NVidia GeForce gt 630 with most sliders turned up all the way very little sputter even when using active sky next most of my aircraft work good with no problem. I belive some problem are mostly direct 10 preview related.