Following the steps below will usually work.
(1) Go to Control Panel, then Network and Internet, then Network and Sharing Center.
(2) Click Manage Wireless Networks in the upper left portion of the window.
(3) If your computer is new, then just click "Add." If not, then click "Add," go through the steps below and then choose the new network as your active network.
(4) Select "Manually create a network profile."
(5) Complete the form in the next window, including your network SSID, encryption type, encryption key, etc. Select the option to conect automatically.
(6) Save. It should say "Network Successfully Added."