after you've installed all the drivers (specifically the network card), go to the control panel, select Network Connections, select Create a new connection or set up a small office or home network. Follow the directions for the wizard.
If installing the drivers creates a connection for you, and you have the router set up to automatically assign DHCP, It should be assigned an IP and and DNS automatically, allowing you to connect to the Internet without doing anything. The default setting in the network properties is to automatically obtain an IP and DNS.
If you already have an internet account, you shouldn't need to do anything with your ISP.