An unknow DirectX error

so afther every windows 10 update i must reinstal directx (cause for some rerason i cant play lol if i dont reinstal it)so yesterday windows 10 update was out so i update it and reinstaled directx i launc lol and i got massage ,,An unknown directx error has occured and league of legends cannot start.Pleas make sure your video card is using the latest video drives from the manufacturer`` (btw i get that massage if i dont update directx afther windows update). I tried everything that i can found (deliting game.cfg,deliting lol_game_client and lol_game_client_en_gb, reinstaling lol) but nothing did work can someone help me ?