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.
Thanks!
~Alex