Like many of you I have been trying to make my older machines break into the newer era of Windows. One major hurtle is the EFI32 on all of the first generation Intel macs that makes installing Windows x64 on them nearly impossible. Recently, I personally using various resources on this forum and on other websites found a way to make a ISO that will install Windows 7/10 x64 on a Mac Pro 1,1/2,1. I've noticed throughout this forum and anywhere else the information on this is scattered, not updated and is not really concise on what you have to do. It's for this reason I chose to write a basic tutorial on how to do this. This tutorial will guide you on how to make the ISO image from a normal Windows 7 x64 or Windows 10 x64. Likely, this would work with Windows 8 or Windows 8.1. I also believe this would work for Vista, but I don't know why you'd ever want to install that.... This would also work on any EFI32 machine that has this same issue, specifically many of the first generation Intel Macs. Requirements: - A computer running Windows XP+. This could any machine with Windows x86 or x64. - A Windows 7/10 x64 ISO image. - The ability to install programs on your Windows machine. 1.) Either put your physical install disk in to your DVD drive, mount your ISO to a folder on your PC or 7-Zip extract the ISO to a new folder. If you have Windows 10 simply right click and select open in Windows Explorer. If you have Windows XP/Vista/7 you will need to use 7-ZIP to extract the files from your ISO. Make sure you extract it to a new folder with only the Windows ISO extract in it. You do not have to extract the files if you have a physical disk in your DVD drive or have mounted it virtually on Windows 10. 2.) Now you need to download Imgburn (http://www.imgburn.com/.) This is a free program that will allow for us to correct the issue with the ISO. Download this program and install it on your computer. 3.) Now, open up Imgburn and follow these instructions very carefully... - Mode -> Build - Under Source click the folder with the magnifying glass. Navigate to the folder one level above where you put your extracted ISO and select the folder containing your Windows ISO extract. DO NOT open the folder, but just select it If you have the disk physically in your disk drive you simply select the disk drive not the individual folders inside. - Options -> File System -> ISO9660 + UDF (Should be option already set.) - Options -> UDF Revision -> 1.02 - Advanced -> Restrictions -> Level X - 219 Characters (Select option.) - Advanced -> Restrictions -> Allow More than 8 Directory Levels. (Check the box.) - Advanced -> Restrictions -> Allow More Than 255 Characters in Path. (Check the box.) - Advanced -> Restrictions -> Allow Files Exceeding Size Limit (Check the box.) - Advanced -> Restrictions -> Allow Files Exceeding Size Limit -> Multiple Extents (Select the option.) - Advanced -> Restrictions -> Don't add ';1' Version Number to File (Check the box.) - Advanced -> Bootable Disc -> Make Image Bootable (Check the box.) - Advanced -> Bootable Disc -> Click the Magnifying glass with the folder -> Navigate to the folder/mount containing your Windows ISO files -> boot -> etfsboot.com -> Select This - Advanced -> Bootable Disc -> Sectors To Load -> 8 - Destination -> Magnifying glass with folder -> Navigate to the folder where you would like your revised image to be placed and give it a name. - Click the Folder to the left of the disc image do not let it change any settings. - Confirm the Volume Label - Agree to the final confirmation and wait for your improved image! 4.) Burn to a disk. 5.) Put disk into Mac Pro, make sure you have no other bootable devices as we cannot select it on the boot menu. Sorry, I'm not the best writer around, but this should be better than most other posts around. I hope that you found this useful. I sure have. I hope you can benefit from my research into this topic. I will leave a couple more Windows 10 Tips at the bottom for the Mac Pro 1,1. Sometime when I have more time I'll make photos or a video. 1.) If you have the nVidia 7300GT, download the final Windows 7 x64 drivers, they will work.