VIsta 64bit UEFI installation stuck on screen 'windows is loading files'

I am trying to install Vista 64bit onto my laptop (Acer V5 171) which has Windows 8 preinstalled. I could not find a tutorial on how to make a UEFI USB for Vista so I followed the one for Windows 7: UEFI Bootable USB Flash Drive - Create in Windows

I have disabled secure boot and set the USB drive at the top of the priority boot list. When I come to select the boot devices it only gives me two options: The boot manager (main HDD) and the USB HDD. It does not seem to recognise the USB as a UEFI boot device as shown in the tutorial.

When I do select to boot from the USB the screen says windows is loading files and after the bar has filled it gets stuck on the same screen until I power off.

Does anyone know how to get Vista to install via UEFI USB?

I'm not by the machine right now so if you require any more information I can post it later.

Thanks!

Did you disable ( CSM)Compatibility Support Module - it should be somewhere in bios settings.

It should then show as something like this:

UEFI:USB-ATAPI DVD

If you have done that - you might need to try plugging it into a different usb port - one on the back of the machine, for example. Lord knows why.

[FONT=Verdana, Tahoma, Calibri, Geneva, sans-serif]Unfortunately the BIOS doesn't allow me to disable CSM. It only lets me switch between 2 boot modes: UEFI and Legacy Bios.

If I select Legacy BIOS the installation setup loads. However, the HDD is formatted as GPT and I am unable to install Vista Ultimate 64bit onto this since it is not supported.

I read that installing on a GPT formatted HDD is possible when installing from UEFI?[/FONT]

Is this any use:
Installing Windows to an EFI-Based Computer