When launching the game @calyarion are you ensuring that you are doing so on the dedicated GPU and not the integrated one?
Your DxDiag has a number of errors so it's best to run System File Checker tool to repair missing or corrupted system files:https://support.microsoft.com/en-ie/help/929833/use-the-system-file-checker-tool-to-repair-missing-o...
Can you also create a new Windows admin account and try it there?
Let us know how you get on.
Darko