Alright, so I think I screwed up. I have an iMac 21" running Mountain Lion and I wanted to completely wipe it to return it to factory settings. I rebooted and went into Disk Utility and completely erased my Macintosh HD partition. That's good and all, but I need to install the actual OS onto that partition. Thing is, I lack the physical disk to do this. How can I put Mountain Lion onto my mac with no OS or disk? Any help is appreciated, Thanks! Edit: Oh, I have a fully functional Windows 7 partition. Maybe I can somehow do it using that?