DirectX problem

<[CRASH] I can't get into a game ,on the loading screen that shows both teams ,I can't get into that part ,is like that bug splash thing but now just shows "An unknown DirectX error has occurred and League of Legends cannot start.Please make sure your video card is using the latest video drivers from the manufacturer." This is the first time ever that this happens ...Please help me... And i got in priority queue because of it >