Windows 7 won't boot into UEFI without a Medicines "
If Windows 7 Setup halts at boot time when displaying OS logo, then you need to apply the Medicines for Windows 7 UEFI loader.
Windows 7 builtin drivers (VGA.SYS and VIDEOPRT.SYS) assume that VGA BIOS (INT 10H) is universally available, but this is no longer the case on modern computers with pure UEFI firmware (without CSM).
Medicines for UEFI loader provides emulation of VGA BIOS (INT 10H) over UEFI GOP framebuffer, thus enabling installation of Windows 7 to the modern computers without CSM.
Also, without this Medicines, Windows 7 just freezes instead of displaying BSoD (blue screen of death) on the modern computers where VGA-compatible hardware is not available (Windows 7 can't switch to classic 640x480x4bpp VGA mode in order to display BSoD). With this Medicines, Windows 7 is able to display BSoD over the UEFI GOP framebuffer, if necessary. "