To find the root certificates update, use Windows Update to scan the computer, and then click Software, Optional. The root certificates update appears under the Optional Software Updates heading.
This item updates the list root certificates on your computer to the latest list that is accepted by Microsoft as part of the Microsoft Root Certificate Program. Adding additional root certificates to your computer lets a wider range of applications work seamlessly. These applications include applications that provide security-enhanced Web browsing, encrypted e-mail, and security-enhanced code delivery. After you install this item, you may have to restart the computer.For more information about Microsoft Root Certificate Program members, visit the following Microsoft Web page:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.