Hi All, few days back when I open my SharePoint 2010 Site I got information as below,But I have genuine key installed
The trial period for this product has expired.
Troubleshoot issues with Microsoft SharePoint Foundation.
Correlation ID: 6121d751-5f37-4ab0-9bbb-df56adeeae2e
In central admin go to "Central Admin" => Monitoring => "Review Rule Definitions" => click on "Trial period for this product is about to expire" rule under configuration and edit it. Uncheck the "Enabled" check-box.