Virtavia B-1B Lancer in Windows 8.1

[brettt777]

I recently got the fine B-1B Lancer by Virtavia and installed it on my main gaming PC. But every time I try to bring it up, FSX freezes up. It won't even load into the kiosk. I tried on my laptop which has both Win 7 and Win 8.1. Works in Win 7, tried to work in Win 8.1 but eventually locks FSX up. Is there something about this plane that prevents it from working in Windows 8.1?
My main system is:

i7-4790 CPU @ 3.6ghz
NVidia GTX-770
16gb Corsair DDR3
Sound Blaster Xz
2tb Seagate HDD
MSI Z97S MB
Windows 8.1
Logitech G940 stick/throttle/pedals

I don't have this problem with any other Virtavia planes. Yesterday I tried running FSX in administrator mode. The B-1B came up in the kiosk normally. When I loaded the flight, it took a while but eventually it did load and the plane seemed to work properly. I tried this a number of times during the day and it worked that same way every time. Today when I tried it that way, it's back to the same old thing; when I select the plane and try to bring it up in the kiosk, it locks up FSX. If I wait long enough, the plane will show up in the kiosk but the flight will never load. I though I had it figured out yesterday but today it's back to frustration...
Could protection software like Norton 360 have anything to do with it?