Cablecard program guide

I have an older computer connected to cox digital TV with a cablecard and a silicon dust homerun prime 3 tuner box.  All of my TV channels are working, but I can no longer get the listing guide.  I have tried setting up my laptop to act as my interface with Windows Media Center and was able to get my setup to display all of my channels (I think) but no guide for TV listings.  I am wondering now if the problem is on my end, or if the problem is on Cox Cable's end.  Is anyone else having this problem?  Any  clues on how to fix it?

Larry