A recorded TV show plays back only audio after you install update 955519 for Windows Media Center on a Windows Vista-based computer that is configured to use digital cable card tuners
You install the October 2008 Cumulative Update for Windows Media Center for Windows Vista (955519) on a Media Center system that has digital cable card tuners installed. When you perform back-to-back recordings, the first recorded TV show plays back correctly. However, the second recorded TV show plays back only audio.
For more information about the October 2008 cumulative update, click the following article number to view the article in the Microsoft Knowledge Base:
955519 October 2008 Cumulative Update for Media Center for Windows Vista
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB959485.