SUMMONERS! I need your help :( ASAP!

So, just yesterday I was enjoying some league of legends (as usual) WHEN suddenly, something terrible happened, and my laptop overheated. :( But, that isn't even the worst of it. My client wont work anymore. I've tried everything under the sun I've deleted folders, reinstalled, updated my windows, EVERYTHING! But still alas, nothing helps.

Before I redownloaded the game, it didn't even open the launched. But after reinstalling, it opens the launcher/patcher but then just closes and open my task manager?!?!

I need some help before I put my head in the oven, ranked is over in a few days and I want to get some games in before its too late :[ HELP!