A product key is a unique 25-character code used to activate a copy of Windows 7 Ultimate. This key verifies that the software has been purchased or obtained through legitimate channels, allowing users to access all features and receive updates. There are two primary types of product keys: Retail and OEM (Original Equipment Manufacturer).
Since your Product ID contains "OEM," your copy of Windows was pre-installed by a manufacturer (like Dell, HP, or Acer). Use these methods to find your actual key: A product key is a unique 25-character code