Launcher Crashes and can't open Minecraft

When I had the new launcher it worked for the first 3 days, after that everytime I clicked play, Minecraft never opened, and I had to restart the PC just to be able to open the Launcher again, but the game itself was still impossible to play. I reinstalled everything but then it got worse. The Launcher opens but when you try to download .minecraft from scratch the launcher crashes, not allowing you to even download the game