My League wont open

My league of legends launcher works but when i click ''launch'' it disappears... i cant do anything... i've tried so many things, at this point i don't know what to do.. can someone please help me.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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