I must admit I'm not an expert,just what I have learned from my own network,but here go's
Have you uninstalled the old BT software?.Create a system restore point first.
I would reinstall the Belkin software,follow all instructions.The set up should look for all wireless networks in range,and list them.Does this happen?
When you click on the desired network,it should connect,unless you have the wireless security enabled .If you do,you will have to input the password.
SSID,is just the name of your network.My router is enabled to broadcast my networks name,makes it easier to identify .
What firewall are you using,it might pay to disable just while you are trying to establish a connection.
Hope this helps