Product key for Windows 8.1 is a unique code used to activate the software.
Product key for Windows 8.1 is a unique code used to activate the software.
Wow! It seems we really have no choice now. You should have backed it up earlier—formatting the hard drive will erase all previous data. Unless you purchased it directly from Microsoft and registered it using the email address you have, there’s a chance to recover it. But if you got it in another way, things are likely lost forever.