Direct X9

PLEEEEEEEEEEEEEEEEEEEEEEEEEEEEASE HELP DURING THE INSTALLATION OF THE LEAGUE OF LEGENDS I GET THAT Direct X9 PROBLEM AND I CANT INSTALL MY GAME AGAIN TO PLAY PLEASE HELP SOMEONE HELP PLEASE..I DELETED AND I DOWNLOADED IT AGAIN BUT I CANT INSTALL IT ON MY COMPUTER!! (I USE WINDOWS 7) PLEASE SOMEBODY HELP ME OUT!!!!!!!