the game keeps saying out of memory

Put the summary of the bug you're having here
game wont start up
What I expected to happen was...:
Describe what you thought should happen here
game start
What actually happened was...:
Describe what happened here
crashes and says out of memory
Steps to Reproduce:
1. download game
2. ...hit start
3. ...mojang screen turns on
4.... goes back to start menu with crash(out of memory)