I feel like a toothless hillbilly - PW DAC

I recently purchased a PS Audio Perfectwave DAC with a Bridge. Everything I read in the manual before the unit arrived would end with something like; "and just plug it in and it will automatically download the drivers and take care of the rest".

Fastforward to today: unpacked the unit and connected the USB input on the DAC to my computer. Nothing worked on two different computers. The big problem I am having is that the owners manual seems to be out of date, and PS Audio is still improving it's latest offerings....but this is very different from the way it is portrated online. For the record, I sell hospital medical equipment and electronic medical records interfaces, so I am not a twit (though I am having my doubts now). The big problem for me right now would seem to be that there are so many connection options for the PW DAC that I don't know how to just play music off my computer.

Please tell me where to start (just to play music from iTunes):

1. Twonky
2. eLyric
3. iTunes
4. USB or CAT5 cable

I will be setting up a network later (which should be a laugh), but for now I just want to hear music!

Thanks in advance,
Jeff