Hi,
1. You may run Network troubleshooter and check if that helps: Using the Network troubleshooter in Windows 7:http://windows.microsoft.com/en-US/windows7/Using-the-Network-troubleshooter-in-Windows-7
2. You may also try the below steps:
a. Double-click on the 'WiFi Connection' icon. It can be found in the system tray at the bottom of the laptop screen.
b. Click on 'Properties.'
c. Select the 'Wireless Networks' tab.
d. Use the 'Add' button at the bottom of the dialog if your WiFi network isn't in the 'Available Networks' section.
e. Click on 'Configure' when you see your network's SSID in the 'Available Networks.'
f. Enter your network's SSID and WEP key.
g. Click on 'Start,' then choose 'Connect To' and 'Wireless Network Connection.' Your computer should now be able to access the WiFi network. If the WiFi network is connected to the Internet, it should also be able to connect to the Internet.
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Also please have a look at the below articles.
http://windows.microsoft.com/en-US/windows7/Connect-to-Bluetooth-and-other-wireless-or-network-devices
http://windows.microsoft.com/en-US/windows7/Add-a-device-or-computer-to-a-network