Description of the update for Silverlight: January 19, 2010

Microsoft Silverlight is a cross-browser, multi-environment plug-in that delivers the next generation of Microsoft .NET–based media experiences and rich interactive applications for the Web. This article describes an update for Silverlight. This update was released on January 19, 2010.

An update is available for Microsoft Silverlight. This update offers a new build that is an upgrade to earlier versions of Silverlight. This update is included in current Silverlight installers. If your computer does not have Silverlight installed, the installer will be offered to you by Microsoft Update or by Windows Server Update Services (WSUS).

This update includes functional, performance, reliability, and security improvements. This update is backward-compatible with Web applications that were created by using earlier versions of Silverlight.

Issues that are fixed by this update

Issue 1

You create a Silverlight 3 application that uses the hardware acceleration feature of the graphics processing unit (GPU). If errors occur in the GPU drivers when you run the Silverlight 3 application, the Silverlight 3 application cannot correctly display the content. This problem occurs because Silverlight 3 incorrectly handles errors that occur in the GPU drivers.

Issue 2

CPU usage is high when you use the Deep Zoom feature in Silverlight 3. This problem occurs when the Deep Zoom feature cannot load or decode a tile. The problem persists even if you minimize the Web browser in which the Silverlight 3 application is running.

Issue 3

When you try to download information in a Silverlight application, the application crashes.

Installation information

This update is available from the following sources.

Microsoft Silverlight site

The Silverlight installer includes all previous updates in addition to this update. To install the latest version of Silverlight, visit the following Microsoft Web site:

Microsoft Update

This update is also available to users of Microsoft Update. If you have an earlier version of Silverlight installed, this update will be offered as "Update for Microsoft Silverlight (KB 979202)."

WSUS

This update is also available on Microsoft Update through Microsoft Windows Server Update Services (WSUS).

If a computer has an earlier version of Microsoft Silverlight installed, this update will be offered as "Update for Microsoft Silverlight (KB 979202)."

If a computer does not have Silverlight installed, this update will be offered by the latest Silverlight installer as "Update for Microsoft Silverlight (KB 979202)."

Silverlight 3 contains an auto-updating mechanism. By default, this mechanism is turned off in the WSUS package. Future updates will be provided through WSUS updates.

For more information about Silverlight, visit the following Microsoft Web sites:

• http://www.microsoft.com/silverlight/faq.aspx (http://www.microsoft.com/silverlight/faq.aspx)
• http://www.microsoft.com/silverlight/resources/documentation/administration.aspx (http://www.microsoft.com/silverlight/resources/documentation/administration.aspx)
• http://silverlight.net (http://silverlight.net)

If this article does not answer your question, click this button to pose your question to other community members at Microsoft Answers:
If you would like to see answers to related issues, click the following links to view topics in the Microsoft Answers forum:

• KB979202 error code message (http://answers.microsoft.com/en-us/windows/forum/windows_other-windows_update/kb979202-error-code-message/9ad7c4b2-b1c7-4f1a-9f9c-5f59dcff8bce)
• Having error installing the most recent Silverlight update (KB979202) (http://answers.microsoft.com/en-us/windows/forum/windows_other-windows_update/having-error-installing-the-most-recent/fbe2c204-248e-4665-97bd-efef12517bbf)
• Error code 643 on update failure (Microsoft Silverlight KB979202) (http://answers.microsoft.com/en-us/windows/forum/windows_other-windows_update/error-code-643-on-update-failure-microsoft/ffe65919-c3e3-4ee2-aca4-3cfdb89a441f)