Describes an update for Universal C Runtime (CRT) in Windows 8.1, Windows RT 8.1, Windows Server 2012 R2, Windows 8, Windows RT, Windows Server 2012, Windows 7 SP1, Windows Server 2008 R2 SP1, Windows Vista SP2, or Windows Server 2008 SP2.

Describes a Windows Defender update package for Windows Server 2019, Windows Server 2016, and Windows 10.

Review the warranty terms, check your warranty status, and learn about the protection plans for your Microsoft device or accessory.

Windows Update Delivery Optimization helps you get Windows updates and Microsoft Store apps more quickly and reliably. You’re in control over whether you use Delivery Optimization with the settings described in this article.

In PowerPoint, learn how to troubleshoot Designer if you don't see the Designer button, no suggestions are offered, or the button is grayed out.

Learn about Xbox consoles, system requirements, and networking, and get troubleshooting help.

Summary. This security update makes improvements to Secure Boot DBX for the supported Windows versions listed in the "Applies to" section. Key changes include the following:

Lists the error codes that may be reported by Device Manager and the possible resolutions in Windows.

Learn how to get your Xbox device serviced.

Here are a few different ways to find help for Windows. Search for help - Enter a question or keywords in the search box on the taskbar to find apps, files, settings, and get help from the web.