Nicky-Cody:
To help you verify that you are using genuine Windows, Microsoft offers a quick and easy online process called validation.
Validation takes only a few moments, and enables Microsoft to create a match between your PC's hardware profile and your 25-character Product Key (located on the Certificate of Authenticity), which Microsoft stores and checks against future activation and validation attempts. We do this to ensure that your Product Key is not used by another person in a malicious manner, such as activating a counterfeit or non-genuine copy of Windows.
Validate Now
Hope this helps,
Greg