In the network and Dial-up Connections folder, right-click the LAN connection and click properties. Select Internet Protocol (TCP/IP) and click properties.
Select Obtain an IP Address automatically and obtain DNS-server address automatically.
Click OK till back in network folder and close it.
Now rightclick Internet Explorer on your desktop, select properties/connections tab.
Select Never dial a connection, then click LAN Settings, in there clear all check boxes.
In the WAN-part of your router, enter the IP-address and DNS-servers that you received from your ISP.
Enable DHCP in the LAN-part.