A Corsair CX750: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139040

No mods.

Tried the game again today after I saw that installing the DirectX End-User Runtime Web Installer worked for some people: https://www.microsoft.com/en-us/download/details.aspx?id=35

It ran for 34 minutes, froze, and crashed with the error pop-up. I'm gonna upload the two pop ups I'm getting to see if they help you.

Do I need to repost this or something?

Hi, I ran Heaven and Valley so I'm gonna upload the results. Also, I have an R9 280x and I tried the latest beta drivers for it last night and ARMA 3 still crashed. My game's up to date too. I don't know anything about memtest but it looks like it takes hours to run, so would it be more of a last resort if we can't figure out what else it might be causing the problems?