The product key, a 25-character code, was required to activate Windows Home Premium 7 and ensure that it was genuine. John had written it down on a piece of paper, but now he couldn't find the paper anywhere. He searched every nook and cranny of his office, but it was nowhere to be found.
Once you have your product key, you can activate Windows 7 using these steps: Online Activation How to find Windows 7 product key on my pc? windows home premium 7 product key
If you already own a license but cannot find the code, try these methods: The product key, a 25-character code, was required