Wh do I get  "OS X (Mountain Lion) caynnot bed installed on "Nacintosh HD"?

Hello there,
Just downloaded Mountain Lion  and when wanted to install it got the message that it can not be installed. Any advide?

Boot with Command-r keys to Recovery and repair your hard drive and permissions.
Make sure your backups are current.

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    <Edited by Host>

    It's Command-R, not Control-R. You won't lose your files or settings if you reinstall 10.9 this way. Why don't you give that a go before reverting to 10.8.
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    Mountain Lion won't install on 10.7.4. Suggestion from Apple is to completely erase the harddisk and install Leopard > Snow Leopard > Mountain Lion.
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