Open Command Prompt as administrator
Type: `wmic path softwarelicensingservice get OA3xOriginalProductKey`
Press Enter
Check the displayed product key
Open PowerShell as administrator
Type: `(Get-WmiObject -query ‘select * from SoftwareLicensingService’).OA3xOriginalProductKey`
Press Enter
Check the displayed product key
Open Registry Editor
Go to: `HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionSoftwareProtectionPlatform`
Look for `BackupProductKeyDefault`
Use a third-party key finder tool if needed
Check the product key on the device sticker or packaging if it was preinstalled or purchased retail