TV Tuner problems

[tigerfootball05]

I just got a Pinnacle PCTV Pro USB TV Tuner for my computer but I am having some problems getting it to work. Basically, every time I try to get it to scan for channels it comes up with nothing but internet radio (which I don't care about). Then when I try to start the player, it says "No TV Devices are available for playback" and then "Channel Could not Be Displayed". I installed all of the software (twice now), have restarted my computer, made sure all coax cables involved are working, but still i'm getting nothing. I have a coax cable running from the wall of my dorm to a splitter to the tuner. The TV connected to the splitter works perfectly. What am I doing wrong?