I cant play league of legends with the new client.

I tried everything. Sometimes i cant even log in (client stacks at authorisation or what its called) sometimes it wont even open. I tried full repair, i unistalled and reinstaled the game from the begging and still nothing. At this particular time i managed to open the client ( after 20 times of trying.) and its stacked on "scanning".. Plus when i try to close the client, it wont close i have to alt ctrol delete to close it... and when i do that it wont reopen but only if i restart my computer... http://imgur.com/a/cCVpB
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