So, the USB DVD device is available in UEFI mode according to that. If your system won't boot the windows 7 disc that means it has not been modified and burned to boot properly on EFI. Windows 7 media almost always only boots in legacy mode though the files to boot in UEFI mode are already on the disc. Check this thread, make a custom EFI bootable windows 7 dvd and you should be on your way. Also, make sure your 'BIOS' is up to date also.
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