Hopefully you have a time machine backup. Follow my directions in my first post in this discussion. Download rEFit (no Terminal digging), install, then restart.when you get back to the login screen, restart again and hold option this time. Open disk utility and erase the os x partition. Then go back to the menu and choose "Install OS X", during the install process, you'll be given the option to migrate from another mac or a time machine backup. Choose TMB. After it finishes, you'll esentially have a clean install of OS X, with your partitions correct. It's a longer process, i know, but i've never had my BootCamp partition touched doing it this way when upgrading fromSnow Leapard to Lion, Mountain Lion, and most recently Mavericks. If you arent tech savy, and get easily confused, digging through terminal will only frustrate you further. Doing it the way i instructed will allow you to take a break from the frustration for a little while, while OS X installs lol i hope this fixes your problem, this fix is a little bit "easier" and less frustrating i think.