Macbook stuck in limbo after attempted os x upgrade
Today I attempted to upgrade the operating system of my macbook pro from Mountain Lion to Yosemite. After downloading the installation from the app store, I restarted my computer and the process began. About half way through, the computer stopped its download and stated:
OS X could not be installed on your computer
File system verify or repair failed.
Quite the installer to restart computer and try again.
Well I followed these instructions, which resulted in the same scenario occurring again, and again. I shut the laptop down and held "control r" while turning it back on to bring me to the recovery mode page. I have never backed it up (this was probably stupid but I am not very techy) so time machine was´t an option. I tried to reinstall OS X but it said both available hard drive options were "locked." And I tried to use the disk utility thing, which stated I needed a repair but the button was unclickable, I don´t know why. I´m wishing now I never tried to update the software because it was working perfectly fine before. I need this computer to do my university assignments please help me! Thanks,
Derrick
MacBook Pro, OS X Mountain Lion (10.8.5)