So I took my laptop for repairs and they wiped it, doing a factory reset. Unfortunately they didn't really know what they were doing as they couldn't get my Windows 10 back. So they've put an unactivated version of Windows 7 on it. I bought this laptop for campus in 2016 and it came with windows 8, and a free upgrade to windows 10 (which I used and was running win 10 smoothly). How do I get back to windows 10?