If the BIOS says UEFI boot-change it and try that. Just boot from the CD Windows disk. I believe Windows thinks there is already a boot partition on your HDD when UEFI is used.
Installing operating systems to UEFI-based computers
Let’s have a quick look at some specific consequences of the above that relate to installing operating systems on UEFI computers.
UEFI native and BIOS compatibility booting
Here’s a very very simple one which people sometimes miss:
◾If you boot the installation medium in ‘UEFI native’ mode, it will do a UEFI native install of the operating system: it will try to write an EFI-format bootloader to an EFI system partition, and attempt to add an entry to the UEFI boot manager ‘boot menu’ which loads that bootloader.
◾If you boot the installation medium in ‘BIOS compatibility’ mode, it will do a BIOS compatible install of the operating system: it will try to write an MBR-type bootloader to the magic MBR space on a disk.
This applies (with one minor caveat I’m going to paper over for now) to all OSes of which I’m aware. So you probably want to make sure you understand how, in your firmware, you can choose to boot a removable device in UEFI native mode and how you can choose to boot it in BIOS compatibility mode, and make sure you pick whichever one you actually want to use for your installation.
You really cannot do a completely successful UEFI-native installation of an OS if you boot its installation medium in BIOS compatibility mode, because the installer will not be able to configure the UEFI boot manager (this is only possible when booted UEFI-native).
It is theoretically possible for an OS installer to install the OS in the BIOS style – that is, write a bootloader to a disk’s MBR – after being booted in UEFI native mode, but most of them won’t do this, and that’s probably sensible.
https://www.happyassassin.net/2014/01/25/uefi-boot-how-does-that-actually-work-then/
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