32-bit64-bitbiosuefiwindows 8
I recently purchased an HP Stream 7, which I was led to believe would have Windows 8.1 64-bit installed. However, it has 32-bit Windows, even though it has a 64-bit processor. Installing 64-bit has been problematic, and I found the reason is the 32-bit UEFI. Is there a way to change it or replace it with a 64-bit UEFI? Are there any other options for installing Windows 8.1 64-bit? Or is this impossible presently?
Thank you.
I believe you can press Esc during bootup to display a boot menu. See if the Linux CD/USB shows up there. If not, try to turn off UEFI Boot and then set the boot order in the BIOS:
As far as Secure Boot goes, here's a Secure Boot bootloader for Linux in case you're interested, and the Linux Foundation should have a valid signed pre-bootloader available sometime soon.
If you're currently booting in BIOS/CSM/legacy mode, you can convert to an EFI/UEFI-mode boot by installing a suitable EFI-mode boot loader. This process is described here, but be aware that this page is geared toward using DUET on a BIOS-based computer; on a system that supports EFI, you don't need to install DUET, so you can ignore the DUET information on that page.
Best Answer
I have read that in order to boot Linux with the 32-bit UEFI, you can swap out the standard 64-bit UEFI GRUB with the 32-bit one from a different distribution and it'll be able to work on the Stream 7, so maybe a similar procedure (swapping the 64-bit UEFI bootmgr with the 32-bit one and reconfiguring the entries to match your installation) might work to get a 64-bit Windows installation running after you installed it with an AIO image with a 32-bit Windows PE.
However, after considering doing this myself on my HP Stream 7 that is currently on its way, I remembered the fact that the minimum requirement for Windows 8.1 x64 for memory is 2 GB, and the HP Stream 7 only has 1 GB. The installation size of a 64-bit Windows is also bigger (as it needs both 32-bit and 64-bit libraries for compatibility), which makes a difference since it only has 32 GB of internal memory. Those have to be the reason why HP even put 32-bit firmware on that device.
Windows Store apps won't care about running in 32 or 64-bit, and the rare desktop programs that would be 64-bit only are probably that way because they require lots of RAM and processing power, which the HP Stream 7 won't be able to provide anyways. So there is no point in installing Windows 8.1 64-bit on it, it would only use up more space and make it very slow due to insufficient memory. Of course, if you want to install Windows 8.1 Pro instead of the Bing version to have encryption and whatnot, go right ahead, that's what I'll do at least anyways. Or maybe try Windows 10 Technical Preview 2 once I know the tablet is fully functional and won't need to be exchanged.
TL;DR Just stick with Windows 32-bit, the Stream 7 doesn't meet the minimum requirements for the 64-bit edition and no program that requires 64-bit would run well on that hardware anyways. Just count yourself lucky you didn't buy a Windows RT tablet :)