League of Legends not working??

Hello, I don't know what is happening with my game... yesterday all fine I played good with no problems... now my game just don't start... When i click to open the game noithing happens and on the task manager one task appears called: RiotClientServices and nothing happens.... The same problem when trying to start PBE.... this morning i play on PBE fine with no problems... now i have this... Can someone please help me?? What is happening with my game???
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