This is from http://bink.nu/news/windows-7-media-center-updates-for-tuner-issues.aspx
Update 1
An update is available for Windows Media Center in Windows 7. This update fixes a deadlock issue that occurs when you use a TV tuner in Windows Media Center. When this issue occurs, you may experience one of the following symptoms:
- You receive an error message that resembles the following when there is no apparent tuner conflict: Tuner Conflict
- You receive an error message that resembles the following when there are available tuners: No tuner available to satisfy the current request
- The Windows Media Center Receiver Service (Ehrecvr.exe) stops responding and you have to restart the computer to recover this service.
Notes
- This issue may occur if you change channels fast and frequently (also known as "channel surfing"), in Windows Media Center.
- These symptoms may be caused by other issues that are not related to this update. For example, you may receive similar symptoms when you try to query current state of a TV tuner or of a malfunctioning hardware device.
An update to the TV tuner functionality in Windows Media Center is available for Windows 7
Update 2
On a computer that is running Windows 7, you use Windows Media Center together with an analog TV tuner to watch live analog TV. In this situation, you receive intermittent Low Bit Rate overlay messages in Windows Media Center.
Windows Media Center monitors the incoming bit rate of live TV. Without this monitoring, the bit rate drops very low when the analog TV input is weak or does not have a signal. This causes a black screen or a static screen to be displayed. With this monitoring, Windows Media Center displays an overlay message to indicate a possible issue with the incoming bit rate when the analog TV input is weak or does not have a signal.
However, the method that is used to monitor the incoming bit rate on analog signals is too sensitive. This may cause a false detection of a low bit rate.Note Many regions have switched over to digital broadcasting. There are hardware configurations in digital broadcasts to convert the digital signal to an analog signal. These configurations can include set top boxes and digital to analog-switch-boxes.
Windows Media Center may display Low Bit Rate overlay messages on a computer that is running Win
