At no time did shclarkson ever say that s/he was using a USB cable modem.
As for any ''cable modem driver'' needed to be used otherwise, it just isn't necessary at all, and there probably isn't one anyway.
I have used my laptop, and my other computers, at many other locations with wired and wireless Ethernet connections; with that network never ever seeing me ever before. Nor had my computer ever used their cable modem, or any model of that brand, before. I just plugged in (for a wired connection) or just turned on and searched for a wireless signal.
No drivers were necessary for that modem (cable or DSL) simply because the only drivers needed were to get my Ethernet connection device (either my internal Enet card or my WiFi card) working. The actual Ethernet connection does not care what it connects to, either a cable modem or whatever, as long as the Ethernet responder device supplies an IP address to my computer, that is all that my computer cares about.
More than likely, shclarkson just has to set up his/her computer to use DHCP (Dynamic Host Configuration Protocol). That way, any Ethernet connection found automatically sets up for requesting an IP address.
If shclarkson ever responds and fills in some additional detail, such as what sort of connections are being used, what OS s/he is using, perhaps even a model of cable modem being used (which would make some needed answers self-evident) then we really don't know enough to start giving more exacting answers, at this time.
Come on, shclarkson, give us some details.