@burgurne, check your drivers, Flightsim X worked on my system without any tinkering. Loosing vibration on a joystick sometimes but that was happening on Win7 too.
Windows 9, eh? Hopefully it would come with more options. I kinda feel locked up with Windows 8.1, especially after upgrading from W8 and losing some search options from the charms bar. The W8 ui just feels quite heavy imo. Awaiting this as wellA Start Menu is also expected to make a return in some shape, way or form.