Apparently Windows 8.1 with Bing Processor is different than Windows 8.1. Where do I get an iso (from a legit source), or how can I activate?
Currently I have Windows 8.1 installed and it does not accept my Windows 8.1 with Bing Processor key...
Windows 8.1 Core and Windows 8.1 with Bing are 2 different editions with 2 different product key sets. So you can't use a key for the Bing edition on normal Window 8.1.
Download the correct Bing ISOs and reinstall Windows 8.1.
Google for those names to find DL links: