I can dual boot if I want to boot Vista and Windows 7 fine, but when I want to go to use Snow Leopard for PC version, I get this error. I went to install OSX after creating a partition for it, then formatting it to what it recommended. After installation was completed sucessfully, it told me to restart my computer, when I went to the screen to pick Snow Leopard to boot, I get a Grub error screen. What is this? I couldn't get passed this error??