The device will probably show as a "USB Serial Converter" under the Universal Serial Bus controller section. If you get the device properties there should be an Advanced tab. On the Advanced tab there should be an checkbox option "Load VCP". Enable this option and then select OK to close the properties dialog.
Then disconnect and reconnect the device and you should see the new hardware wizard hopefully automatically load a driver for a new device (the Virtual COM Port). If this does happen then you should have a "Ports (COM&LPT)" section in Device Manager with the new COM device that you can further configure.
The above is all based on an assumption that the Moates device is going to present the same as a generic USB Serial Converter device. I've never actually seen one physically so can be definitive sorry.
Cheers,