My nephew was trying to install XP on his new Macbook but chose the wrong partition. (He's not one known for reading guides and ignored "Do not select “Leave the current file system intact.” To successfully install Windows XP, you must select one of the other options.") And eventually the screen displayed "Disk Error" Of course, he can't eject the XP disk (but can power down). But on power up, his Macbook boots from the CD and tries to install XP again. I've searched high and low for a definitive solution. Any bright sparks here or misfortunates who have experienced this problem? Help would be most appreciated. Fixed it! Simple, hold down the Option key when rebooting and choose the Mac HD option - delete partition using Boot Camp app again, and start again, this time reading the Boot Camp guide!