Article ID: 938927 - View products that this article applies to.
When you configure Windows Media Center to use a digital TV tuner in Windows Vista, you lose the Electronic Program Guide (EPG) channel listings for some channels. You also lose the EPG channel listings for the sub-channels of these channels. Additionally, the recordings that you schedule do not run.
This problem occurs 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.
Service pack informationTo 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:
935791After you install this service pack, disable the Opportunistic Scanning feature. To have us disable the Opportunistic Scanning feature for you, go to the “Fix it for me” section. If you would rather disable the Opportunistic Scanning feature yourself, go to the “Let me fix it myself” section. 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.
(http://support.microsoft.com/kb/935791/ )How to obtain the latest Windows Vista service pack
Hotfix informationTo 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 "Registry information" section.
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:
http://support.microsoft.com/contactus/?ws=supportNote 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.
PrerequisitesNo prerequisites are required.
Restart requirementYou 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 "More Information" section.
Hotfix replacement informationThis hotfix does not replace any other hotfixes.
Registry informationAfter you apply this hotfix, disable the Opportunistic Scanning feature. To have us disable the Opportunistic Scanning feature for you, go to the “Fix it for me” section. If you would rather disable the Opportunistic Scanning feature yourself, go to the “Let me fix it myself” section. 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 informationThe 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, 32-bit versions
Collapse this tableExpand this table
Windows Vista, 64-bit versions
Collapse this tableExpand this table
Disable the Opportunistic Scanning feature
Fix it for meTo disable the Opportunistic Scanning feature automatically, click the Fix this problem link. Then, click Run in the File Download dialog box, and follow the steps in this wizard.
Fix this problem
Microsoft Fix it 50209
Note this wizard may be in English only; however, the automatic fix also works for other language versions of Windows.
Note If you are not on the computer that has the problem, you can save the automatic fix to a flash drive or to a CD, and then you can run it on the computer that has the problem.
Now go to the "Did this fix the problem?" section.
Let me fix it myselfImportant 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:
322756To disable the Opportunistic Scanning feature, follow these steps:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
Did this fix the problem?
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.
To re-enable the Opportunistic Scanning feature, set the value of the DisableActualStreamOpportunisticScanning registry entry to 0. Or, delete the registry entry. See the registry editing steps in the "Let me fix it myself" section.
To restart the Media Center Receiver Service, follow these steps:
(http://support.microsoft.com/kb/824684/ )Description of the standard terminology that is used to describe Microsoft software updates
Article ID: 938927 - Last Review: October 8, 2011 - Revision: 7.0
Contact us for more help
Connect with Answer Desk for expert help.