Windows 10 with directx 12 installed, can't change any vid settings or game crashes

[AzB]

with an error about not finding directx 9.

I'm running a Geoforce GTX 960m vid card on a Dell Inspiron with core i7.

Any ideas? I've tried updating the video driver but it's current. Game will run, but the frame rate is so slow that everything is very jerky. I just want to tone down some of the detail to get smooth graphics, but I can't change anything. I have tried reinstalling the game.

FWIW, I can't alt tab out to other running Windows or it will crash the game with the same error message. I haven't had any of these problems until the last couple months.

TIA!