Hello. Any help will be appreciated. After a failed Boot Camp Windows 8 installation my drive has 50 GB empty space (the former partition) that Disk Utility can't merge with the main partition nor format it. And if I boot from the USB stick made by Boot Camp, Windows begins the installation, but inmediately reboots and I can't even access to insert the product key. I've read about some other utilities that can fix this partition problem (Testdisk, GPT fdisk), but I'm not that advanced user and I think that I have messed up enough. Thanks in advance and excuse my english.