I installed the boot camp program. Instead of installing windows I was going to install Ubuntu linux. Well I messed something up big time. When I restart my computer a message comes up and says can't find hard disk. When I restart and hold down the alt/option button I can boot into the mac harddrive(without a option for linux). The linux was not installed at all. How do I erase the 5 gb for the windows partition? I tried to put in the mac install disk and it still would not let me reinstall over the entire 55 gb. It only said 50. I went to the disk utility but It would not let me erase the windows section.