The problem is that most computers only have one input, which is typically used for a mic such as you have on a headset. You don't have a stereo input, so there's no easy way to just plug from the line outputs on the DP008 to the computer. If you have powered monitors, or a stereo with line inputs, you can run directly from the DP008ex to the stereo or monitors.
What "soundcard" does your PC have?