I've gotten my WMC in a bad state. After trying various free tools to enchance WMC with channel editors and the like, it no longer updates the channel guide.
What is required to reset my WMC - can I uninstall/reinstall, or do I need to clear out additional files and registry entries?
Edit - WMC runs fine in other all other ways. It plays video, recorded TV, and live TV - it just won't update the guide.
I think this program http://thedigitallifestyle.com/w/index.php/2011/07/05/windows-media-center-guide-editor-2-0-1/ is what broke the listing.