Mavericks: Install failed. How to revert back to previous OS X?

Hi
I was running Lion on MBA. I downloaded Mavericks today and the install has failed. It says I have a disk error.
I have tried 'repair disk' and no joy.
The issue I have is that my MBA keeps trying to install Mavericks.
How do I get back to where I was before?
I assume my MBA will have to go into the Apple store to have the disk looked at. I've checked and it isn't part of the exchange program.
Many thanks guys.

Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears.
You have the option to repair drive and to re-install OS X.
I would try repair drive and repair permissions first.
If the internal drive fails to work, you can attach an external drive and create a partition the size of your internal drive. Format as GUID.
Install OS X on this partition. While booted from the new partition, you can try recovering your data from the internal drive, Time Machine or clone backup.
Once you have recovered your data, use Disk Utility to Erase the internal drive then clone your new partition back to the internal drive.
I like SuperDuper for cloning.
Download SuperDuper! — http://www.shirt-pocket.com/

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