ATTENTION CONFUSED PEOPLE: If you have nosTEAM's copy of BO2 (skidrow) just start up the game with admin and then load up the map you want for zombies then start it up. From here you will start up the trainer with admin privileges and then to see if it works right off the bat try messing with your score to see if it worked (I'd recommend trying to do this process in windowed mode makes things a lot easier in my opinion) if it didn't work try running it without the admin privileges (I think trainers sometimes work for running admin or no admin on certain ones) and it should work but if not then it's most likely an error on your end. Hope I've helped.