You only need the Virgin Media (ntl:telewest) broadband disc if you are connecting direct to the modem using USB.
A new PC as supplied by a shop that includes a network card, is ready to be connected to the modem. You don't need extra software.
To connect more than one PC to the modem at the same time you need a router (unless you opt for the sometimes complex Internet Connection Sharing method). You only need one router for your network.
Routers come in two forms:
- wired: Usually allows 4 computers to be connected each having ethernet cables. Some more expensive routers will have 8 connections.
- wired with wireless: Most routers of this type will have provision for up to 4 wired connections, and additional connections by wireless.
As I've said above, wireless is desired if you want to minimise the number of cables running round your house, or if you have a protable computer such as a laptop. Each computer you want to connect wireless needs it's own wireless adaptor (in stead of the standard ethernet based network card). Most modern laptops, and some sophisticated desktop PCs will come with wireless adaptors inside.
Wireless does have a limited range, adequate for most normal houses. Some people find interference can cause some loss of speed / connectivity. It's convenience makes it popular, but it's not for everybody, particularly those who might move large amounts of data between computers on their own network.