repair failed screen

I have tried the hextech repair tool uninstalled and reinstalled several times but i keep getting the repair failed screen and nothing else. when it first happened it made me restart to several league clients before taking me to repair mode and then after finishing repair mode it says repair failed everytime i reinstall. I can no longer play league after successfully patching and not going in game coming back and launching this repair failed screen. Please let me know if you have the same thing happening/
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