DirecTV actually provides you two downloads to help with setting up a PC for TV viewing. The DirecTV2PC Playback Advisor is a small utility that tests a PC's processing speed, graphics, memory, and network. Run this first to ensure the computer hardware can support video streaming. Then install DIRECTV2PC itself. This application assumes you already have your DVR connected to your home network. When you run the application, it automatically finds the DVR over the LAN and starts a video session.
Unfortunately, DIRECTV2PC only works on Microsoft Windows computers.→ See also - How to Connect a PC to a Television