Can't activate secure boot after upgrading from Win 7 to Win 8 on a Spectre XT

Hi everybody,
my first post here, so please forgive me if the topic has already been discussed
I did search before posting anyway, but I couldn't found anything addressing this specific point.
My (small, I must admit) problem is as follows:
I recently purchased a Spectre XT 13-2005tu (i7 processor, 4Gb RAM, 256Gb SSD) with Windows 7 pre-installed.
After installing my favourite applications and using it for a few weeks without any trouble, I thought to take the opportunity of the $14.99 upgrade to Win 8, so I downloaded Windows 8 Pro and installed it (as an upgrade, rather than a fresh installation, because I didn't want to loose the customizations I already made).
I also installed all the updates available on HP website (sp59158 for updated BIOS, sp58404 for UEFI support, ecc.)
The whole upgrade worked nicely, and the PC is now up and running with Win 8.
Now, I'm trying to use at best all the possibilities Win 8 has to offer, and among them, the UEFI secure boot.
I found the "legacy support" option in the BIOS settings, which as I understand must be disabled to activate the UEFI secure boot, but if I do that the PC tells that there's no operating system on the disk and doesn't boot anymore.
Which was a bit scary by the way, but eventually I could re-enable the legacy support in the BIOS and have the PC working again, but of course with no secure boot.
I suppose there must be some other re-configuration that should be done before changing the BIOS parameter, but I couldn't find any instruction for that anywhere on the web.
On the other hand, it would be indeed weird if the secure boot could not be configured AFTER the OS upgrade, and a new fresh installation would be necessary.
I'd rather part with the secure boot than re-install everything, but that would be a shame... :-(
I hope someone can explain what should be done, many thanks in advance!

Thanks for your feedback, but I don't think your issue is the same as the one I previously explained.
The UEFI/secure boot setting is a basic configuration affecting the way the PC boots, regardless of whether it is connected to a network or not.
By the way, in the meantime I've seen in a shop exactly the same PC model which I'm using, now sold with Win 8 pre-installed, and it was working with the UEFI enabled (= BIOS "legacy support" disabled).
Therefore, the configuration I'm interested in has to be feasible, one way or another...!

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