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How do I A) Get rid of Grub and B) go back to Windows 8.1
Hi, I'm in a bit of a unique situation at the moment. I have grub because I required linux for about a month and decided to use it to dual boot it with Windows 10. I deleted linux, but I still have grub. I also (unknowingly) deleted my backup of Windows 8 from my laptop, so right now I'm just on Windows 10. I do not have the sticker under my laptop that has my product key (I'm not even sure I had one of those stickers), so what am I to do if I wanted to 1) remove grub, and 2) go back to Windows 8.
Also, if I can't go back to windows 8, will I at least be able to upgrade to Windows 10 for free through their upgrade program? Thanks for any answers you can provide, I really messed up here.
Edit: The reason I want to get rid of GRUB is that it makes upgrading the builds a huge hassle (having to be around when the system restarts)