i got a hp notebook laptop from my grandson as he bought a new one, when i got it he had it full of games, homework, and all sorts. so i decided to factory reset the laptop, i followed all the steps on how to do it, it advised that if it was passed onto a friend or relative to do a full reset, which i chose to do. i pressed start and off it went, about 30 mins into it aprox 46% it stopped saying it had encountered a problem, and to press cancel, which i did. i then tried to boot windows 10 back up and all it would do was show the hp logo with a blue backround. it would not recover the laptop saying sorry can not repair this computer, i tried everything but the laptop refused to boot up, i am a complete novice with computers, but i think what it has done is wiped part of the main data i needed to boot back up, it kept saying it could not find pzander user on start up. so I gave the laptop to my brother in law who knows a bit about computers, he installed a version of windows 10 pro onto the laptop and it runs fine, but it will not let me activate windows, i thought that when the laptop was purchased with windows 10 (energy star) on it, windows would recognize it but it says no. it seems it was not a genuine copy of windows he installed. Is it possible to retrieve the original windows 10 that was on the laptop ? at the time i ran a test on everything and they all passed, if that helps ?