I have purchased Windows 8 Pro ($39.99 - Full, I believe) and I'm trying to install this as a clean-install over a preloaded Windows 8 Core (I need to format the drive, get rid of hidden recovery partitions and adware that comes preinstalled with new systems). So I have downloaded the upgrade assistant and created a bootable USB key - the installation never asks me for my key.
After the reboot, and selecting Languages, Region and Time Zone the system simply throws out a message "The product key entered does not match any of the Windows images available for installation. Enter a different product key." and then proceeds to the first screen - never actually letting me enter my key for Windows 8 Pro.
Can you help?