I have exactly the same problem. While my device manager lists a lot of HID devices, I do not seem to have the MS eHome driver installed.

After plugging the device into my computer, I can definitely see that the device driver for the 9600 loaded. I can see a Pronto device in the Devices and Printers. I even see the 9600 as a disk drive in the device manager (albeit without media), but I cannot see the device as a separate drive when I look at my files and folders in Windows Explorer.

Through trial and error, I finally figured out the conflicting HID devices...features of my Logitech keyboard.

I basically have 2 choices: either I disable around 8 HID devices and reset the pronto, or I install the MS Virtual XP, install PEP inside and make USB devices available to XP. This is a bit of a pain as it generally requires me to restart my system before downloading to the device.

I would love to find a way to do this natively in my Windows installation without having to either disable features on my Logitech keyboard or running it in XP.