Messed Up League

Having the same problem .-.

Try uninstalling League, going into your C: drive and deleting the "Riot Games" folder, then reinstall. I've done this several times in the past and it seems to work for me.

I found a another solution, you go in into the Riot Games folder and click the run as admin launcher, as opposed to the normal launcher.

Hope this method works for you bro, and good luck on the rift :D