Computer not working after trying to install Maverick!

So I tried to install Maverick on my MacBook Pro last night but it comes up that the hard drive is damaged and that I need to repear it. The problem is that I can't repear it on the Disk Utility and when I restart it as it says in the installation screen it just gets back to the installation and I'm back to square one.

Anyone that can help me??? I really need my computer and don't have time to hand it in to get fixed!