Mountain Lion can't find hard drive to install it on

I used unibeast through my 10.7.4 on a dell optiplex 745 ( everything works besides sound and AppStore login) and when I try to instal ml it only gives me the oPtion to install back on the USB pen drive that I have the unibeast and ml on. How do I get my dare drive to show up. I've tried using disk utility. Any suggestions?

I have the same problem with maveriks install, any solution?