No. If you have a router, moden and the cat 5 cables thats all you need. It is connected as is now but it isnt getting online. I had the exact scenario four days ago with a client here close to home. It was resolved after creating a new connection similar to what I had you create already here
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Except this time try this one:
Open the networking icon in the control panel.
Click "create a new connection"
Connect to the internet
next
choose from a list of internet service providers
next
then follow any promts after that..
If that doesnt work then call the isp tech support, its real close.