Ok, I have a 15.4 Inch MacBook Pro with a 2.4 GHZ Processor, 200 GB HD. I installed Windows XP Pro SP2 via BootCamp on it, but then decided to use VirtualBox instead. So I started the BootCamp Utility and erased the partition. Now when I try to start up it still trys to boot to Windows. How do I completely remove the partition.