the pc that has the connection, go to control panel, network connections, right click on the internet connection and select sharing. tick the appropriate boxes,usually all of them and reboot the computers. Make sure the laptop has obtain an ip address automatically in the network settings. If you get a dns error on the laptop when trying to browse, just put ipconfig into a cmd prompt on the pc and make a note of the dns. Put these into the laptops network setting under tcpip/advanced.