Game runs, yet is completely unplayable

[CuriousHouseElf]

I've tried all levels of mouse sensitivity in the game, and my mouse drivers are all up to date. And it doesn't work even when it's the only program running. Like I said it worked fine a few months ago when I had a worse GPU and less RAM and was on Windows 8 instead of 10. I haven't changed anything else on my rig. Same mouse, same keyboard, same everything.