Check the sticker on your PC or laptop
Check the box or paperwork that came with your Windows purchase
Open Command Prompt as administrator
Type: `wmic path softwarelicensingservice get OA3xOriginalProductKey`
Press Enter
Check your Microsoft account for digital license details
Use PowerShell with admin rights
Type: `(Get-WmiObject -query ‘select * from SoftwareLicensingService’).OA3xOriginalProductKey`
Press Enter
Use a third-party key finder tool
Check your email receipt if you bought Windows online
Contact the PC manufacturer or Microsoft support