
NOTE: You might need to purchase an external DVD drive if Vista refuses to install to the MBR partition when using the DVD drive that came preinstalled with your PC. After Vista is installed, install all the drivers you downloaded and you'll be good to go. Now you can perform the Vista installation as normal. Step 5: You're ready to install Windows Vista! Finally, Type convert mbr and press enter, and close out of the installation. Then, Type select disk 1, and press enter. Then click "Open a command prompt window" In the command prompt, type diskpart and press enter. Load up the Windows 7/8 DVD and select "Repair your Computer" then it will search for Windows installations. You will also need to use the Windows 7/8 DVD for this step. Load up the Windows 7/8 install disc, and just go through the install until you get to the "Where do you want to install Windows?" screen, and delete all partitions, and then close out of the installation You will need a Windows 7 or Windows 8 DVD for this step. Watch this video on how to disable secure boot in Windows 8: Step 2: Disable Windows 8 Secure Boot & Enable legacy support Once you've bought the PC you want, you might want to go ahead and download the drivers for your PC for Windows Vista. The PC you are looking for needs to have an NVIDIA Geforce GPU or a Radeon GPU in order to be compatible with Windows Vista. I too will be downgrading, or excuse me upgrading Windows 8.1 to Vista Ultimate SP2

If anybody knows of a simpler method, please share it. Should though since he's done it multiple times where he works. I've personally never tried this yet, so I can't confirm if ot works or not.

Might as well share it here I guess, so this is what he told me. I actually know a friend off YouTube who works at a computer shop, so he ran me down the list of instructions on how to downgrade 8 to Vista. Really never mind re-installing an OS on a new computer, but that Secure Boot just about makes it nearly impossible it would seem at first. I'm actually about to buy an AMD APU PC soon, and it too is pre-loaded with Windows 8.1.
