Hi SammyLee, sorry for the delayed response.
Have your nephew reinstall the game.
If that doesn't work it could be something truly AIR related. Have him read the info on this page: Troubleshoot installation of AIR on Windows
". Maybe your nephew can figure out what's going wrong after reading through that info.
Hope one or the other suggestion helps you out. And (sounding like a broken record here
)… Please post a follow up when you find a solution to your problem.