I used to have a Windows Professional license, and I want to retrieve it.

Hi 方 秦,

I understand how stressful it can be to lose track of a Windows product key, especially when you need to get your system running again. The good news is your license isn’t gone — it just depends on how you originally purchased Windows.

• Microsoft account: If you linked your license, sign in at account.microsoft.com and check Devices or Services & subscriptions.
• Retail purchase: The key may be in your confirmation email or on the original packaging.
• OEM devices: If Windows came preinstalled, the key is stored in the firmware and can often be read directly.
• Volume licensing: Keys are managed in the Volume Licensing Service Center.
• Support or reseller: If none of these work, contact Microsoft Support or your reseller with proof of purchase.

Let me know how it goes, and if this answer helps, feel free to hit “Accept Answer” so others can benefit too 😊

Domic Vo.