If you do not have this directory, or file on your USB drive, fear not. This is how you create it.
First, create a new directory called Boot inside the \EFI directory
You will then need to copy all of the files from the \EFI\microsoft\boot directory, up one level into the directory you just created (\EFI\Boot).
Next, use 7-Zip to open the archive located at: *:\sources\install.wim (* is the drive letter of your USB key that holds the Windows 7 installation files)
Inside the archive, find the file located in folder "1" \Windows\Boot\EFI\bootmgfw
Copy this file to *:\EFI\Boot\ location you created earlier. (Not in 7-zip) (This file is also available from any current windows 7 installation). It is located in the C:\Windows\Boot\EFI directory.
After copying the file to the EFI\Boot directory, rename the file in *:\EFI\Boot\bootmgfw.efi toBOOTX64.EFI. You should now have an EFI bootloader directory for Windows called *:\EFI\Boot\, with all of the files copied from the EFI\microsoft\Boot. Directory, and the newly named BOOTX64.EFI
Your install media (DVD/USB) must be inserted into your PC prior to powering it up. This will allow your UEFI to register your device (DVD drive/USB drive) as a UEFI boot enabled device.
1 :
UEFI Windows 7 64Bits installation using a USB drive
ref ->
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Windows/Windows_7/Q_27525576.html
notice :
i.Boot menu in Bios , choice advance CSM enable, then boot USB key to install Windows 7.
ii.When boot the stage of choosing partition disk in error driver , input DVD\CD ROM , that can pass.
2:
Windows 8 - 製作 Windows To Go - USB 隨身系統碟
http://chenweichi.blogspot.tw/2012/05/windows-8-windows-to-go-usb.html
ps:
製作完 Uefi USB key boot x64 win 8
都複製到USB 上, disk format is FAT32
windows 7 , windows 8 資料夾都直接複製貼上.
唯一要變動只是 --> BootX64.efi <--
即可安裝 雙作業系統 win7 x64 win7 x32 , window 8 9200
