Internal pinnacle tv tuner, Comcast....can't configure channel 3

The Pinnacle software will display TV coming in on channel 3 from my Comcast
box.  But I want the Media Center.  I'm Vista Premium 64.

Media Center searches for and finds a dozen unreachable channels.  I want it
to look on channel 3 and I'll change the box like I did on my old XP Media
Center that ultimately died.

Channel 3 ... can anyone help me configure that.         Thanks...Dave

If you are telling MC that you have a STB then try telling it you have an

If you are telling MC that you have  a STB then try telling it you have an
antenna.