Os x mounatin lion cannot be installed on Macintosh HD

Hello!
I just downloaded Mountain Lion from app store and ran it. After rebooting i have chosen install on my Macintosh HD and after about 5 mins i recieved a message "os x mounatin lion cannot be installed on Macintosh HD". what's the point??

we have a problem.....
another solution - buy a hard drive and a usb external enclosure (not an external hard drive).......
take your old hard drive out and install it in your usb external enclosure.
install your new hard drive in your macbook.
connect your usb external to your macbook's usb port.
power up your macbook and keep your finger in the option key until you see the apple logo....
you'll get a boot menu, choose your external drive as the boot drive - when ML installer pops up, direct it to install it in your new hard drive....
once the install is done, restart your macbook and open migration assistant and use that to bring your files and apps from your bad hard drive over...

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    Message was edited by: donv (The Ghost)

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