Riot Games or other players please help Me! League is not updating and not closing (Video below)

So,I have installed the game,but when I try to update it or what ever,it stucks at random % I don't know what to do! https://www.youtube.com/watch?v=8D23PDBMxIE&feature=youtu.be <<<<<<< VIDEO what I have made! Thank you! Respectfully lvsandis!
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