Recently I removed the Intel Pro Wireless Manager from my Dell D420 laptop. When it was removed I had the Radio set to off because I was plugged into my LAN via Ethernet. Once it was removed and I rebooted I was unable to see any wireless networks in the Wireless Network Connection configuration window. In the Wireless Network Connections Window you will see the below message.
There are two different things that could be the issue if you run into this problem. Each of these problems is listed below along with resolutions to each one.