Re: Big problem : missing textures, missing sound, long loadings...
That the game worked after you changed it to full screen is weird, did you tested the game without your second monitor?
Shut your PC down > disconnect the monitor > start the PC and test.
There is a newer driver for your 380 available, please preform a clean installation.
If that don't helps, preform a clean boot and test the game afterwards.
Edit: That "crying in rage" part don't need to be repeated, it usually don't helps, and I do not say anything about your Boyfriend. 😉 🙂
Edit2: There are also a lot of "MissingWinningComponentKey" errors in your DxDiag.
Run the Windows System File Checker Sfc /scannnow and post the concluding message.
