when you start the game, does the game start on world 0-1 or something like that? If so, then the ROM was hacked and the code was altered. That happened to me when i tried to play it. Just get another emulator. Is this what happened though??

Later

no it wouldnt start at all

i would try a different emulator and/or a new game. You can find it around in different places, just look.

Later