How do I find all channels in Windows Media Center?
Some TV service providers offer channels that don’t contain the necessary information to show up properly in the Guide. In some cases, you can still watch these channels even though Media Center can’t display the information in the Guide. To use these channels in Media Center, follow the instructions below to manually add the missing channels.
On the Windows Media Center start screen, scroll to Tasks, click Settings, click TV, and then click Guide.
Click Add Missing Channels, and then follow the instructions.