Does your PC have a wireless card?
Read the instructions for your new lappy, regarding enabling connection (this usually involves pressing a button on the machine)
Check out the sky site for settings on your router:
Check your make and model of router, and use the info in the link above.
When you have your laptop's wireless feature enabled, a small icon should appear on the taskbar, and you should get the message "Wireless networks are available" Right click this and choose your router from the list of available networks.
You may be prompted for a network key (assuming you have set one up) If you have not DO SO you don't want others using your connection.