If when you are using the new PC, click on View wireless networks,
If it shows you are connected to your host network but are not actually connected, click on disconnect, then go into change order of preffered networks and delete the host network.
Then go back in and view available networks, and it should show the available network you want to connect to,, then press connect and it should ask you for password for WPA, (you are encrypted aren't you????)
After you type in the password/key you should be able then to log on and off again anytime!