Sometimes it won't work and I have to unplug it for about 10 seconds and then, after plugging it back in, it seems to reset itself and works fine afterwards. I once had to uninstall and then reinstall it to get it to work.
Clutching at straws here until you tell us why you're asking :O)
A router is similar to a hub in that it will allow you to network more than one computer using CAT5 cable. A router however is different to a hub in that you can plug a cable modem into one port that will then share that modem with all the computers plugged into the router. The modem is not connected to any one PC. Its similar to Internet Connection Sharing in Windows just better.
Some routers will have the cable modem built in -though thats more the case with ADSL Modem Routers.
If you only have one computer to connect to the cable modem you won't need a router.
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