Mountain Lion Does not install on MacBook Air 2010

Installing stopped on: (remaining time 17 mins). I have waited 1hr, but nothing happens.
After reboot, this situation repeated 3 times!
Please, help! What I should do to restore my computer?
Thanks.

Restart your Mac and immediately press the Command and R keys. Your Mac should start from the Lion recovery partition.
Open Disk Utility and click your OS X Lion volume, typically named "Macintosh HD". Note: If FileVault 2 is enabled, you will need to click "Unlock" on the toolbar, and then enter your admin password to unlock the drive.
Click the "Repair Disk" button and let Disk Utility complete a repair of the drive.
After this, restart. If the same issue is happening, boot with command R again and reinstall the OS from there.

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