Comcast DTA MCE Setup Steps
Very detailed step by step instructions for using a digital tuning adapter within Media Center for those in need.
Many cable operators around the country are reclaiming analog space (separate from the over the air digital transition). If you have a cable set top box, nothing should change. If you connect coax out of the wall to an old analog set, you MAY need a Digital Terminal Adapter, DTA for short from your cable company. Most will make this available free of charge.