Your USB drive must also contain the directory and file: "*:\efi\boot\bootx64.efi" (* is the drive letter of your USB key that holds the Windows 7 installation files). This is the ".efi" installation boot loader extension. If you do not have this directory file on your USB drive this is how you create it:
First, create a new directory called boot inside the "efi" folder on the USB. You will then need to copy all of the files from the "*:\efi\microsoft\boot" directory into the directory you just created ("*:\efi\boot"). Next, use 7-Zip to open the archive located at: "*:\sources\install.wim."
Inside the archive, find the file located in folder "1\Windows\boot\efi\bootmgfw.efi." Copy this file to "*:\EFI\Boot\" location you created earlier. (Not in the 7-zip) (This file is also available from any current windows 7 installation. It is located in the "C:\Windows\Boot\EFI" folder.)
After copying the file to the "*:\efi\boot" directory, rename the file in "*:\EFI\Boot\bootmgfw.efi" to "bootx64.efi". You should now have an EFI boot loader folder for Windows called *:\efi\boot\" with all of the files copied from the "*:\efi\microsoft\boot" folder 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/USB drive) as a UEFI boot enabled device.
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