From that last post, I'm not really sure what bit of kit is causing you the problem. Was your old PC connected to the modem via USB? If so, give up on that and use the ethernet connector which, as others have said, will only need the windows based drivers for the ethernet card, not for the modem as well.
If you have a cable modem then it will normally have either only an ethernet port for the most modern types, or an ethernet and USB port (you can use one or other, but not both simultaneously). All cable broadband is supplied via the coaxial type connectors, with modems supplied by Virgin Media as part of your subscription. If the modem is faulty, or otherwise unsuited through perhaps call Virgin Media for a replacement.
ADSL is somewhat different as instead of the ISP providing the modem, you can often purchase your own, frequently with a combined router, to plug into the phone socket type connector. You can't buy your own cable modem for Virgin Media (once upon a time in the very early days you could, but not now or for a long time), so routers are a standalone piece of kit that connects to the cable modem's ethernet port.