League of Legends crashes before loading screen and causes my computer to become inaccessible

This problem has been occurring for a few months. League of legends crashes, but continues to load on a blank screen, allowing me to do nothing but stare at the blank screen. I can't alt+tab, I can't access my task manager to end the process, I can't do anything but sign out of my computer and sign back in.

It would be nice to be able to go to my desktop or task manager when League of Legends decides to crash, so I can at least end the process???