CMがディスコで叫んでるけどメインメニューでクラッシュする奴の対処法だとさ
associated_mediaフォルダとやらを削除してゲーム再起動

>Hi! For those who play on PC and experience a crash in the main menus shortly after launching 76, can you please try deleting your "associated_media" folder, and then relaunch the game client? (Don't worry, the game should recreate this folder on its own)
>It can typically be found in a folder path like this one:
>C:/Users/YOURPCNAME/AppData/Local/Project76