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PS C:\windows\System32> Get-WmiObject -Class Win32_BIOS | Select-Object SerialNumber

SerialNumber
------------
1H84492N78


PS C:\windows\System32> (Get-WmiObject -query 'select * from SoftwareLicensingService').OA3xOriginalProductKey
K6YNW-7MRDK-TTYY8-QMRGY-6VKCT
PS C:\windows\System32>