Look for a Certificate of Authenticity (COA) sticker on your device. For laptops, it is often on the bottom or under the battery. For desktops, it is typically on the top or side of the case.
If Windows 7 is currently installed and activated, you can use tools like Belarc Advisor or ProduKey to retrieve the key from the system registry. buy microsoft 7 product key
You can try running the command wmic path softwarelicensingservice get OA3xOriginalProductKey in an elevated Command Prompt to see if the key is embedded in your system's firmware. Activation Steps Look for a Certificate of Authenticity (COA) sticker