My laptop was sold with Windows 8.0 and a COA sticker with no key. Now I understand the UEFI has whatever takes the place of the key stored in it in the CMOS, right? I've updated to windows 10, but my question now: If I get to where, say, a year from now, I want to do a clean install, what version of Win10 do I have to download? I don't have Pro or Media Center. Do I have to get ahold of a retail version or do I need a OEM single system licensed edition? When it asks for the key, what do I do, do I need to use Belarc to see what the key is before I do this?
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