So, I've been trying to install vista on my Mac Pro, but every time I try to install it on my 160GB drive, it always says "Windows is unable to find a system volume that meets it's criteria for installation." I know why it says this; because my other hard drives are not recognized in vista due to the fact that they are GPT partitions. The solution is to disable the other drives in the bios, which is impossible on a Mac. So, how do I go about fixing this?