Assuming that you are using some version of Windows, the CDC driver should come pre-installed and detect Serial-over-USB connections, but we have seen reports around the web (not related to JeVois) of some versions of Windows not detecting CDC devices. So far all Linux and Mac hosts seem to correctly detect CDC, except for another report on this forum here of a Tegra board that did not have CDC drivers in the kernel provided by NVidia.
Which exact version of Windows are you running? We can try to reproduce here if we have that version.
Have you searched around a bit for windows CDC drivers? Would you be interested in trying something like this one: