How i re upgrade windows7 to windows10 ? - Microsoft Community

i've upgraded  windows7 windows10,now crashed i've recovery laptop windows7,how upgrade windows10 again?

when upgraded previous version of windows or receive new computer preinstalled windows 10, happened hardware (your pc) digital entitlement, unique signature of computer stored on microsoft activation servers. windows 7 or windows 8 genuine license running exchanged diagnostics key.

anytime need reinstall windows 10 on machine, proceed reinstall windows 10. automatically reactivate.

so, there no need know or product key, if need reinstall windows 10, can use windows 7 or windows 8 product key or use reset function in windows 10.

if prompted enter product key, click 'i don't have key' , 'do later'

from working computer, download , create bootable copy:

step 1: how download official windows 10 iso files

step 2: how to: perform clean install of windows 10

Windows / Windows 10 / Install, upgrade, & activate / PC