[Gareth]

Just to check, you have the PC hooked-up to the router via an ethernet cable to start with, as opposed to trying to connect via wireless?

Also, when you've powered everything up in order (cable modem first, followed by router, followed by PC) what flashing lights - if any - are displayed on the router? You should see at least Power, Internet and one of the LAN PC Connections depending upon which port on the back of the router you plugged the ethernet cable into.

Assuming the correct LEDs are displayed, have you configured your PC? Make sure that the network interface card you've plugged your ethernet cable into is configured to obtain an IP address automatically, and that the DNS server is obtained automatically too (the steps for this are explained in the manual). Also, make sure that Internet Explorer isn't configured to use a proxy server, or if it is, that you have enabled the "Bypass proxy server for local addresses" . Next, open up a command prompt and type ipconfig /all and paste the output here.