Java crashes when opening a world

I created a 1.8 world, the world generated, however, before Minecraft could start rendering anything 3 dimensional, Java failed, Windows closed Minecraft, I started Minecraft again, selected single player, selected the world "1_8 pre release", and Minecraft crashed while rendering the text "downloading terrain".

After trying to load my world many times, my world ran for about 5 seconds, then the graphics froze,the window said "not responding", Minecraft music still played for a time then stopped.

This did not happen in 1.7.10; Thanks ahead of time.