: On older laptops and desktops, the product key is usually printed on a Certificate of Authenticity (COA) sticker located on the bottom of the laptop or the side/back of the PC tower.
This tool would:
: Some users navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SoftwareProtectionPlatform to find the "BackupProductKeyDefault" entry, though this often shows a default key rather than the unique retail one. windows home basic product key