Use the -window-mode exclusive command line arguments.
Restore mhyprotect.Sys from your Anti-Virus and add it to exclusion list
Make sure that:
You can choose one of these solutions:
Make sure that you have enabled Widescreen Adaption in Other Settings
Extract .zip file in <path-to-game>\BH3_Data\StreamingAssets\Video
This usually happens on Windows N, make sure you have installed Windows Media Feature Pack