Thanks for your help, Trouble, but none of that seemed to be the issue. The radio buttons were already on and WLAN had already started. I did a system restore to a point before this was an issue (to see if any third party software was interfering) and that didn't resolve the problem either.
Also, there are red X's by "Bluetooth Network Connection", "Wireless Network Connection 2", "Wireless Connection 3", and "Local Area Connection" in Control Panel Network Connections. I don't know if this is helpful, but it can't hurt.