I know I'm late chiming in late here, but I followed firehawk44's advice. And guess what? I have not had one problem since in regards to ctd on 8.1. Much thanks firehawk. The machine is an Acer Predator Intel Core i7-4770 Processor,12GB Memory,2TB Hard Drive,with the Nvidia GTX760 Graphics. I'm not a techie, so I did the Fry's purchase. FSX was giving me fits until I found this thread. Thanks again. (I don't post much at all, but I'm a repainter and have many paints up)