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I am attempting to install Arch linux and dual boot it with windows. As I am running a modern UEFI system, I have put my SSD (see Specs below) in GPT format (losing my original windows installation in the process) where I plan on installing the UEFI boot loader, Windows, and Arch. At the moment I'm trying to reinstall Windows 7 (Professional x64), so I can do a UEFI boot. When I use Rufus to create a bootable GPT USB drive, I get the boot error 0xc0000225. When I try to do it manually with these (http://www.eightforums.com/tutorials...e-windows.html) instructions, my computer does not recognize my flash drive as bootable (it gives the insert proper boot media error). I am using this (http://msft.digitalrivercontent.net/win/X17-59186.iso) for the ISO, I also have an old installation disc. Booting the ISO without modification in Legacy BIOS works just fine, but I have no way to install windows to a GPT drive while booting in Legacy BIOS (Windows states it cannot be installed to a GPT drive, probably because it detects the system is running legacy bios instead of UEFI). How can I install Windows 7 onto GPT?

Specifications: CPU: i5-4670k Motherboard: Z87x-D3H Gigabyte SSD: OCZ Vertex 3 (Set in GPT mode) HDD: Western Digital Caviar Blue Flash Drive: 8GB JetFlash Transcend USB 3.0

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From Resolving the dreaded Windows 8 0xC0000225 error :

I've had this happen to me twice, all of a sudden Windows 8 refuses to boot and gives an error code of 0xC0000225 (or something) and anything you do won't fix it. The problem is that since for whatever reason Windows thinks there's no bootloader, it refuses to boot. Period. You can't even go into the recovery environment, which is my biggest complaint at Microsoft.

In any case, there's one way I've found to resolve this. If you have access to another computer, take out the affected computer's primary drive and find a way to mount it in the system (internally, externally, whatever). Then do the following:

  • Open command prompt as an administrator
  • Type in "diskpart"
  • Type in "list disk". Find out which disk the affected drive is.
  • Type in "select disk #", where # is the affected drive's number
  • Type in "list partition", find the partition number of the system partition (it's usually 100MB, 200MB, or 300MB), then type in "select partition #", where # is the system partition's number.
  • Type in "assign letter=z", assuming you don't have a Z: drive.
  • Exit out of diskpart by pressing CTRL+C
  • Type in BCDBoot [Drive letter of affected drive's Windows partition]:\Windows /S Z: /F UEFI So if the affected drive's Windows partition is say G:\, you would type in BCDBoot G:\Windows /S Z: /F UEFI

It should fix the bootloader. If you can get into a recovery environment on the affected computer, then this should work as well.

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Set Rufus to MBR for UEFI with FAT32 file system to cause it to partition the flash drive as an MBR drive with a single FAT32 partition which contains the Windows UEFI boot files. Additionally you may want to disconnect all other drives. I was having an issue where my HDD which contained a copy of my old SSD installation partition was being recognized as a valid boot drive. This was causing the 0xc0000225 error (in addition to the flash drive being partitioned with the GUID partition table.

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