Install failed OS X could not installed on your computer

That's bad. First priority, if you don't have any backups, make some ASAP!

Once you've got backups, you can try repairing your hard drive with DiskWarrior. If that fails, you'll need to erase the hard drive and reinstall the system from scratch. If that fails, your hard drive may be failing physically and will need to be replaced.

http://forums.macrumors.com/showthread.php?t=1412338

I am also having this exact same problem on my iMac. I have tried Repair Disk and still doesn't resolve.

I encountered this issue today and restarted many time and tried to repair, how ever the Repar option is disabled while installing.

I experienced the same thing and solved it.

In my case the problem was a corrupt mountain lion install dmg file downloaded from the app store. This specific installer corruption issue was experienced by thousands of users who downloaded ML from th MAS during a specific time period. The problem was exactly what you describe and the solution was to delete the copy of mountian lion, re-download it from the app store, and install. By the way, all my data was perfectly intact once i installed a good version of ML.

I mention this because it is a whole lot easier that torching your drive or any of the other crazy things people told me to do when trouble shooting the problem. I'm glad i started with the basic stuff first. You need to be able to get to the app store to redownload it. You can create a useraccount on any mac and login with your apple id to download it. If you don't have another mac then a trip tot he apple store for a usb might be an option.

sreenath Reddy wrote:

I encountered this issue today and restarted many time and tried to repair, how ever the Repar option is disabled while installing.

You need to boot your Mac whilst holding down Command+R and use DiskUtility from there. You cannot repair it from the DiskUtility in your Utilities folder.

Cheers

Pete