When you watch Live TV or Recorded TV in Windows Media Center on a computer that is running Windows Vista, the picture may appear distorted or pixilated

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Consider the following scenario.You have a computer that is running Windows Vista Ultimate or Windows Vista Home Premium. The computer receives digital cable by using a CableCARD. However, when you watch Live TV or Recorded TV in Windows Media Center, you may experience macroblocking or blocking artifacts. For example, square sections of the picture are not displayed correctly. These sections may appear to be missing, or they may appear as a single block of color. Additionally, the picture may appear distorted or pixilated. If you rewind the video, the distortion appears again at the same location in the video.

This problem is most likely to occur when one of the following conditions is true:
  • You watch or record TV from a high definition (HD) channel.
  • The motion of images on the screen is very fast.
  • Scenes changes occur quickly.

Service pack information

To resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
935791 How to obtain the latest Windows Vista service pack

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


No prerequisites are required.

Restart requirement

You must restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
Windows Vista, x86-based versions
File nameFile versionFile sizeDateTimePlatform
Update.mumNot applicable1,77008-Aug-200715:04Not applicable
X86_4cc9546dad9dbf46478f6ac0f2a08bf1_31bf3856ad364e35_6.0.6000.20656_none_a9ab74f821314d3d.manifestNot applicable69908-Aug-200715:04Not applicable
X86_microsoft-windows-ehome-msdri_31bf3856ad364e35_6.0.6000.20656_none_647c0f78045c3bd5.manifestNot applicable22,80608-Aug-200715:04Not applicable
Windows Vista, 64-bit versions
File nameFile versionFile sizeDateTimePlatform
Amd64_17b80195232f28871631e8f96683ea7b_31bf3856ad364e35_6.0.6000.20656_none_e2100fd6fc0c58fa.manifestNot applicable70308-Aug-200715:04Not applicable
Amd64_microsoft-windows-ehome-msdri_31bf3856ad364e35_6.0.6000.20656_none_c09aaafbbcb9ad0b.manifestNot applicable22,83208-Aug-200715:09Not applicable
Update.mumNot applicable1,77008-Aug-200715:04Not applicable
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Vista Service Pack 1.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
824684Description of the standard terminology that is used to describe Microsoft software updates

Article ID: 941102 - Last Review: 01/16/2015 09:46:06 - Revision: 2.1

Windows Vista Home Premium 64-bit Edition, Windows Vista Ultimate 64-bit Edition, Windows Vista Home Premium, Windows Vista Ultimate

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