[Launcher/Client] Game won't Launch

Basically, I've done everything I can think of from reinstalling League of Legends to restarting my computer, basic troubleshooting steps, and I am still receiving this problem. It will bring me to the launch screen, I'll click launch, then nothing happens. I checked my task manager to see what was going on, and every time, without fail, after I click launch, anything LoL related is no longer there, implying it's been closed or it shut down. Does anyone have any kind of an idea as of what I can do to stop this from happening? Is it just me?