You will need software version 5.1 to enable HUI control along with the MIDI. I'm not sure how you're configured/connected to the PC, but you may want to look into the other thread on here relating to converting the D8B into a control surface for your DAW. You SHOULD be able to have limited control in PT 8, via either MIDI or HUI, but again you will need to upgrade to 5.1 for HUI to work (someone else correct me if I'm wrong please).
You may want to watch this:
http://youtu.be/sNtHdg0FA0kThis is the solution currently being developed by Marc Girard, and is discussed in the other thread on these forums. As you can see, Marc has gone to great lengths to incorporate many cool features into his conversion software. This provides FULL mappable control to the entire D8B console for your DAW, and bypasses the physical limitations of the single MIDI card/HUI combination, and provides some unique features and assignability you simply cannot get from the D8B any other way. One of the main drawbacks however is, you give up the Analog I/O of the Mixer, and would need to use external pre's.