good luck trying to actually run aol or diablo 2(no clue why u want to play diablo 2, the game is old, go play some newer games, they're a lot better) decently...
u have to remember, the xbox is several time slower than today's computers... (yes i know it meets sys req. for both apps, but still...)
i would think that even if u could run windows, the individual apps would prob. screw up.... the only apps u could run would be word processors and simple email clients... which can be just coded individually for the xbox, instead of porting windows