Hi everybody. I've just joined MacRumors Forums for a few days. I've tried to research so much before creating this thread. So I hope that somebody can help me to resolve my problem. And here it is: I have a new MacBook Air 2011. I tried to re-installing Lion by RecoveryHD because it had gotten struck before. But the system displayed a report like this: "This version of Mac OS X 10.7 cannot be installed on this computer." Thank you for all of your points. Dear.