| Time to try to repair your hard drive.
Boot to your OS X installer. Go to the Disk Utility, from the Utilities menu.
Select your hard drive, and click the Repair Disk button - different from Repair Disk Permissions.
If that doesn't help, then you will need some disk repair app that might help, such as Disk Warrior.
If Disk Warrior doesn't help, then you should back up your important files, and have the hard drive replaced. You could try an erase and install again, but I suspect that your hard drive is failing.
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