Please help league wont open log in screen after i click launch

I really wanna play league when urf comes but i cant seem to open my client i would open league and click lauch but then nothing happens the client dissapears and im just back at my desktop. i cant even download the new beta there is no button for me to click and ive tried opening as admin and going to open it from the files and ive also tried waiting over 10 mins but nothing seems to work?!?! This issue happened after my computer did something to my hardrive and restarted someone please help me. Oh and i also tried repairing :)
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