I just installed one of these the other night to take advantage of my Comcast cable when I was in another room from the TV. First thing is that I obtained a DTA box for free from my local office and decided to use this in my setup. These were tuners being given out for people who had basic cable and did not want a full set-top box or digital upgrade at the time of the digital transition. The box is installed between the service cable and the USB tuner. The tuner needs to be set to either channel 3 or 4 and that selection needs to be chosen on the DTA box. It goes without saying that everything needs to be plugged into the computer while setting up the device. Here is the stuff that will be consistant with all applications:
1. Install drivers from the driver disc.
2. Decide whether you are going to connect using an antenna, cable without a settop box, or cable with a settop box.
3. Select Start>Windows Media Center.
4. Select Tasks>Settings>General>Windows Media Center Setup and follow the on-screen instructions.
An important note is that if you are using a DTA box, select analog signal to make it work. I found that with the antenna or digital cable without the DTA box, I got very few channels. Hope that this helped.