Microsoft KB Archive/938927

= You lose channel listings for some channels and the recordings that you schedule cannot run when you configure Windows Media Center to use a digital TV tuner in Windows Vista =

Article ID: 938927

Article Last Modified on 9/11/2007

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APPLIES TO


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

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Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry



SYMPTOMS
When you configure Windows Media Center to use a digital TV tuner in Windows Vista, you may lose the Electronic Program Guide (EPG) channel listings for some channels. You may also lose the EPG channel listings for the sub-channels of these channels. Additionally, the recordings that you schedule cannot run.



CAUSE
This problem may occur if the television broadcaster changes the information about the channels. In this situation, the Opportunistic Scanning feature updates the channel information according to the new channel details. For example, the Opportunistic Scanning feature updates the channel information when the broadcaster updates the titles of the channels. This may cause EPG information for the affected channels to be lost.



RESOLUTION
To resolve this problem, apply the following hotfix. Then, modify the registry to disable the Opportunistic Scanning feature. For information about how to do this, see the &quot;Registry information&quot; section.

Hotfix information
A supported hotfix is now 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 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
No prerequisites are required.

Restart requirement
You must restart the Media Center Receiver service after you apply this hotfix. To do this, restart the computer. Or, you can use Microsoft Management Console (MMC) to restart the service. For information about how to do this, see the &quot;More Information&quot; section.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

Registry information
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

After you apply this hotfix, disable the Opportunistic Scanning feature. To do this, follow these steps:  Click Start, type regedit in the Start Search box, and then press ENTER. Locate and then click the following registry subkey:

 On the Edit menu, point to New, and then click DWORD Value. Type DisableActualStreamOpportunisticScanning to name the new entry, and then press ENTER. Right-click DisableActualStreamOpportunisticScanning, and then click Modify. In the Value data box, type 1, and then click OK.</li> Exit Registry Editor.</li></ol>

Note If the EPG channel listings for the channels have already been lost, delete the channels, and then rescan the channels after you apply the 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, 64-bit versions
<div class="status_section">

STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

<div class="moreinformation_section">

MORE INFORMATION
To re-enable the Opportunistic Scanning feature, set the value of the DisableActualStreamOpportunisticScanning registry entry to 0. Or, delete the registry entry.

To restart the Media Center Receiver Service, follow these steps:
 * 1) Click Start, click Run, type services.msc, and then click OK.
 * 2) Right-click Media Center Receiver Service, and then click Restart.

For more information about the terms that are used to describe software updates, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: channel loss

Keywords: kbfix kbqfe kbpubtypekc kbexpertisebeginner kbhotfixserver KB938927

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