My league client wont work at all

So i have that problem where sometimes where my league client wont work. It used to happen less often, and i would just need to shutt off/on the wifi and reopen league. things started getting worse, i had to delete every time, now it just doesnt work whatsoever, i may have redownloaded it 10 times now, i tried the ctrl-alt-delete thing the greek dude did, ive tried just about everything. If i try to open it, it shows me the logo before it opens for about a minute and then disappears into the night like my dad (jk). serious problem: please help my duo must think im dead