I've been trying all day to install Windows on a 2009 Mac Pro where I don't have a Windows DVD or blank to create one. I would just be interested to see if I can get it to install via USB or other method (I want native Windows not virtual machine) I managed to get a boot to a Windows 10 installation this morning then it kept crashing when installing graphics drivers so I gave up that method and thought I'd try Windows 7. Since then I have managed to fiddle Bootcamp to create a USB but it is not recognised when rebooting to start the thing off. My feeling from googling around is that the USB is a 3.0 and my Mac Pro 2009 only supports booting from a 2.0. On the other hand how did I get it to work this morning with 10 even then I couldn't get it to complete properly? (Maybe I've broken the USB drive somehow?) if all else fails I guess I will have to get a blank DVD and create a Windows disk from my ISO image and try that way. But if anyone has any experience with this or ideas for me to try I'd be grateful. It seems so backward to have to resort to physical media in 2015. My mini and MBA both installed via this USB.