League of Legends 4.21 patch launcher not working

So in patch 4.21, a recent problem I had to deal with is the launcher either opening, and closing after clicking,"LAUNCH", or not responding at all when I try to open it. I've tried to run as administrator, and do all the things suggested, and it wouldn't work. So, after poking around with it a bit, I found a solution. On windows 7/8, go to Computer