I can share my experience with you, how install the driver.
First, install using the setup.exe didn't work for me: ok I work in IT so I can find a solution
in device manager, I right click on the unit, and chose "update driver software" (or something like that)
next, choose "browse my computer ..." (or let me pick up....)
next, I don't remember exactly, but you there is an option to install hardware, where you choose manually the type of hardware you want to install (something like "install the hardware that I manually select from a list")
So, I choose the type of device (I choose for "sound, video and game device"), browse your computer and choose for the driver (for me it was in the folder "vista64" (I'm using windows 7 64 bits).
After that, windows recognize the unit and it woks perfectly