Are you trying to get FTA or subscription channels? With FTA, there are plenty of PCI and PCI-express cards, some with 4 tuners. I have the TBS 6981, if I remember correctly. Otherwise, with subscription services, you'll need a capture card. I have the Hauppauge Colossus for HD. Included with that was WinTV which works well to change channels on the STB. I was using the Hauppauge WinTV-HVR1800 when I had SD. Both include IR transceivers, and can learn from your remote. The FTA tuners and Colossus requires the use of middleman software such as DVBLink to get them to work with Windows Media Center. The nice thing about the FTA tuners is that you can watch ALL MPEG streams coming in on any tuned transport stream with the correct software.