I should explain that OEM keys are not typically displayed and are part of the hardware's firmware. The user might be confused about how to find their key. Let me structure the report into sections: purpose, understanding the key structure, retrieval methods, OEM vs retail differences, and security considerations. Also, note that using third-party tools might not work for OEM keys. Warn against key generators and piracy, which is important. Maybe provide steps for activating Windows if they have the key or need to transfer it. Emphasize that OEM keys can't be transferred to another PC. Also, mention that since Windows 7 is outdated, they should consider upgrading for security reasons.