Mac air won't start after attempt to upgrade OS to Maverick

I was prompted by APP store that a new OS Merverick was available so I decided to install.
I downloaded the OS via APP shop (therefore no disc) and check for the updates for other software before restarted the Mac.
Since then, it won't start up the system and keep stack on the grey screen with a apple mark.
Having checked some forum in the Apple Support Communities, I managed to open a disc utilities and tried to repair.
At the first instance, there were some error occurred, but after few attempt with the disc utilities it now says that HD is fine.
However, main HD which is displayed on the left side of disc utilities is gray and I can repair permission.
It also says that HD (journalled) which terminology that I have no idea what this means.
Several attempt with the disc utilities, when I tried to restart "Apple symbol" appeares and several second later the "NO ENTRY" symbol appears and get stuck.
At this point, I decided to re-install OS X Lion from the CD, but when I try to select the HD is says that HD is locked.
I am completely lost to what to do next.
I have several files on this MAC which I would like to rescue if possible.
I have never had any issue with HD and I can only deduce that this was caused by the new OS installation.
Could someone help please?
Thanks.

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