You can reinstall Windows from scratch using the product key that came with your PC, but you’ll have to find installation media yourself. Microsoft offers free Windows ISO files — if you know where to look.
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How to Download Windows 7, 8, and 8.1 Installation Media — Legally
You can reinstall Windows from scratch using the product key that came with your PC, but you’ll have to find installation media yourself. Microsoft offers free Windows ISO files — if you know where to look.
Full article