I just finished upgrading my motherboard, PSU and RAM for a little more performance and was expecting to need a new Windows key, but after adjusting my settings in bios after powering on for the first time it just started like normal. I played a game on steam, watched YouTube, everything seems fine.But In settings I get a message in red letters that says I can't customize my PC without activating windows, but I'm not sure what that means because I haven't found anything I can't customize. I ran an update that worked fine, so my question is, what isn't working, or what is a reason I need to purchase windows 10 again for?