World freeze for my best world! HELP!!!!!

[11justsomekid]

Hello! For the last year, my most pridest of joys mapwise has been malfunctioning. When I click the button to load the world, it kicks me back to the title screen. I wait a few seconds, and try again. Then it freezes onto the loading dirt-wall screen. I spent many hours to create this world. Please HELP!!

Edited June 25, 2015 by 11justsomekid