Tried to install OS X Mavericks.  It wiped my mac clean and now I can not re-install Mountain Lion.  Help?

Lost my previous thread. I have a Macbook Air.  Installed Mavericks but it shut down the machine, on opening it upi all of my files etc were gone.  Tried to use external back up to restore but to no avial.  Now trying to reinstall Mountain Lion.  Can anyone help me?

I could not report the crash as my lap top was out of order. So now it's working. Should I report the crash and to whom? Do you have any link for that?

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