Get yourself a network card with series N format but you should have one already on your motherboard which if the motherboard was made within the last year or so will support B/G and possiblly N . Windows 7 suports N but can work back to B/G .Is your new computer the host for your router if so it will be connected to your router by a cable. It will depend on what type of internet service you have be it broadband cable or adsl . If your new computer is the host then you will not need an extra card.