Hi Eddy,
Okay, I hooked up the V-Studio 100 and here's what I found...
I installed the latest drivers and even with the old firmware (1.2) was able to see the VS100 in Sonar audio prefs.
You should start by making sure the drivers are properly installed and Windows sees the device. Look in the Device manager under Sound, Video and game Controllers (The VS100 must be powered on or it won't show up) and confirm the vs-100 is there, and under Properties, says it's working properly.
Next, go to sound devices, and make sure the VS100 is selected as default for playback and recording. You can right-click on each and by clicking "test" it will make a sound so you know it's enabled.
Let me know when you get this far. (Also, feel free to PM me if you want to continue this offline).