Hmm, I can't make up what is causing the access violation from this (maybe there are people on this forum who can). But make sure to try things like starting the game as administrator, or check if you aren't missing any files in your JJ2 folder. And if all of that doesn't work I'm thinking of re-installing the game, but since I'm no expert in acces violations I would consider trying out the other things and waiting for replies since the solution might be way simpler :P Good luck!