I have just tried this. I start from my included Mac OS X disc, go to disk utility and in the sidebar, I click on MacBook (changed it from Macintosh HD). Then I go to first aid and click on repair disk. It does this and when the little status bar gets to the end, it all goes blue (the bar) and just says repairing yet when I look above at what is going on, in green writing it says repairing disk. I wait for two or three minutes and it just stays like that and I can even hear that the Mac OS X disc is bearly been spun. So all I do is click stop and then it comes up with something saying one thing could not be repaired. So I just turn my MacBook off and start up as normal, and Boot Camp still does not work. What am I to do?