FYI -
I updated my GTX 970 GeForce driver yesterday to the ver: 361.43 released 12/21/2015 and FSX (boxed on Win 8.1 on a high end 4790K PC) won't start and the whole CPU freezes up on the splash screen. I rolled back to ver: 359.06 released 12/01/2015 and all is back to normal.
Bruce