I have one of those HP Stream Laptops that have only 32GB Hard drives in them. I had Win 10 on it but I went to do a clean install and it won't take it any more cause of space I believe. I decided to go back to the original Win 8.1 Core that came with it and has the embedded key in the BIOS. I downloaded the 8.1 install from the program Jan Krohn named Heidoc.net Windows ISO downloader. I believe they are all Retail ISO's. My key is an HP OEM that is in the BIOS. From what I understand it should activate as they are Core install and core key. It won't activate. I am attaching the info from the PID key program for my BIOS key. What is the solution to activate this machine. Thanks.