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Hello and thanks for using JustAnswer.com I am Serge and I will try my best to assist you.
Just to clarify, which Windows version did you computer originally came with? is it the same one you have right now?
I see that was 8.1. . please try steps in this link, as it will help with re-downloading and -reinstalling version 10.
let me know how it works for you
but before trying, make sure you save your key using info in this link: http://www.thewindowsclub.com/find-windows-10-product-key-using-vb-script
Do you still require assistance on the issue?Will be waiting for your reply.