Booster20

So yesterday I decided to make a Minecraft world. It was pretty good, I got diamonds, but then I got tired and decided to go to bed. Next morning when I opened the world, it just says that the world is corrupt. How can I fix this?

I'm having a problem where every time I try to open the launcher it just won't open! Nothing is popping up, no error message or anything. Has anyone had this happen to them?