Yesterday, I clean-installed Windows 8 Pro x86 on an old Dell Vostro 1400 laptop which had been running Windows 7 Ultimate, and it activated and ran fine, without even a single exclamation point in Device Manager. I applied the update necessary to make the Store offer 8.1 and proceeded to install it as I've done on a couple other machines. After downloading the thing, it errored out with:
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