Need some wise advice...I'm in the middle of a brand new build...it's been a very long, drawn out affair as my free time is extremely limited. I've got Win 8.1 running very nicely now (first and only OS installed), a few other apps, and that's it. I've just been tweaking the system and still installing everything into the case. I have a new copy of FSX that I haven't even installed yet; also Saitek X55, and expect to use PMDG products. Should I move to Win 10 first? Upgrade or fresh install? (can you do a fresh install if you're only upgrading?). I haven't seen any comments about a new install of FSX on a Win 10 machine and whether or not there are activation issues. Or, would be safer to get FSX going and upgrade the OS later (though I expect comments NOT to do that).