I backed up my personal files, but never thought to back up the license key (won't make that mistake again). The issue is, I don't know what my old license key was. In the end I had no choice but to reinstall from scratch. I tried the advanced startup options to refresh/reset Windows, they didn't work. I think I had to click 'Reactivate' but it worked fine.Ī few days ago Windows 10 stopped booting, it kept blue screening at boot. Last year I built a new PC, and simply switched the SSD from my old desktop to the new one, and all was good.When I did that, I activated Windows 10 using the key written on a label on the desktop. A couple of years ago I upgraded to Windows 10 Pro using the free 7-to-10 upgrade offer.Bought a used PC in 2012, came with Windows 7 Pro already on it.I didn't buy the Windows 10 license, it was imported from my previous PC.
