Microsoft KB Archive/931364

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Article ID: 931364

Article Last Modified on 12/27/2007


  • Windows Vista Ultimate
  • Windows Vista Home Premium
  • Windows Vista Home Basic
  • Windows Vista Ultimate 64-bit Edition
  • Windows Vista Home Premium 64-bit Edition
  • Windows Vista Home Basic 64-bit Edition


When you try to use the Online Media or Internet TV features of Media Center Extender on a Windows Vista-based computer, you may receive the following error message:

Video Error
Files needed to display video are not installed or not working correctly, please restart windows media center or restart the computer


This problem is caused when a network router blocks the network packets that are sent by an online service to deliver media content such as movies or music. Some network routers block various media-based network packets that are sent by some online services.


To resolve this problem, download and install update 938126 for Windows Vista, and then manually change the Windows Vista registry settings for Online Media.

To download the Windows Vista Update

The following files are available for download from the Microsoft Download Center:

For x86-based versions of Windows Vista
[GRAPHIC: Download]Download the 938126 package now.

For x64-based versions of Windows Vista
[GRAPHIC: Download]Download the 938126 package now.

To update the registry

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

322756 How to back up and restore the registry in Windows XP and Windows Vista

  1. Click Start [GRAPHIC: Start button ], type regedit in the Start Search box, and then press ENTER.

    [GRAPHIC: User Account Control permission] If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.
  2. Locate and then click the following registry subkey:


  3. On the Edit menu, point to New, and then click String Value.
  4. Type MFNETSOURCE_DISABLE_UDP, and then press ENTER.
  5. On the Edit menu, click Modify.
  6. Type 0, and then click OK.
  7. Exit Registry Editor.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


For more information about Media Center Extender, visit the following Microsoft Web site:

Additional query words: winvista vista wme xntdr Troubleshoot windows

Keywords: kbfix kbprb KB931364