You'd think Microsoft would have planned better for the Digital Transition with Windows Media Center but apparently they missed an important detail.
Microsoft fumbles the digital TV transition | Ed Bott’s Microsoft Report | ZDNet.com
Clicking through the multiple explanation screens produced a series of clear-sounding messages about what to expect in Media Center, depending on the type of tuners you were using. According to this screen, for anyone using an ATSC tuner there was “no additional action needed.”
That advice was wrong. Microsoft apparently forgot to plan for one of the side effects of the transition, in which some broadcasters changed broadcast channel numbers along with the switch.