Minecraft doesn't load properly.

I don't use MODs. No matter which version I try to play, I get the same effect. When I try to open a map, it's supposed to show some screen right before when a percentage meter loads to 100% right before it opens. Now it just flashes 0% then opens the map where it crashes seconds after loading the world. It says building world, then flashes 0% then opens te map and crashes. I have created new games on several versions and tried previous saves as well. I have completely deleted and reinstalled minecraft 3 times and no fix.