What happens if you open (double-click) the H: drive? Are there driver files in there?
A common practice of many similar devices (bluetooth dongles, usb ethernet dongles, wifi dongles, firewire dongles, et al) is to add a bit of internal memory that mimics a CD or USB memory stick, and then put the dongle driver files on that "storage" part of the device. In essence, think of it as though the manufacturer supplied a driver installation CD, but it's merged with the dongle itself instead of as a separate CD. For the manufacturer, it's more economical than having to toss a physical CD into the box.
Plug in the device and the storage part shows up, but not the dongle part. Run the installation routine from the storage part and it installs the proper drivers for the dongle part. After that, the dongle should be working.