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Okay after many steps I think I fixed my launcher.
Frist my client opened fine but wouldn't do anything after I hit play once I finished updating for the jinx patch. So I tired running as admin, didn't work. I tired changing the capability and that messed up it every more. so then would I click on it without running as admin it would tell me the pvp.net stopped working. If I ran as admin nothing would happen and it would sit there unresponsive.
FIX: First uninstall the game, I used cc cleaner as that gets rid of everything unlike the built in uninstaller. next I uninstalled pandia media booster using cc cleaner. Then I deleted everything out of my recycling bin. Then I used cc cleaner to fix registry errors (not sure if this was a problem or not but can't hurt to fix). Then restarted my computer. Let everything load up first as if you just jump right into the next step you will want to pull your hair out because it is taking so long. Open up your task manger. Then go and re-download league of legends from the site. It will now re-download the pandia media booster automatically. Lunch the game when it is finished. NOW it might not respond and still get stuck. so use the task manger to close it and right click and re-lunch as admin. NOW it will take a long time (30 mins- 45 mins) to lunch but it is working. when it finally comes up you will see the launcher and it should automatically start re-patching! that should fix it!
IF this does not work for you please let me know and I will see what I can come up with, a lot of people are thinking that after you re-lunch after re-downloading and open as admin and it looks to be not opening when it really is so patience!
HOPE THIS HELPED AS I WAS VERY ANNOYED MY SELF WHEN I COULDN'T PLAY TODAY!