Nevermind... the issue ended up being related to a wifi extender I installed a week ago.  As soon as I unplugged it, my issue went away.
The last couple days I have had issues connecting to my home wireless network.  The PC recognizes the network, but is not able to connect to it ("Can't connect to this network" error message). I generated a wireless network report (netsh wlan show wlanreport), which contained a number of errors, but I am not sure what they indicate (bad wireless card?). If connected with an ethernet cable to the router, the PC is able to connect to the network. The network card is an Intel Centrino Wireless-N 2230. Thanks in advance for any help. 
Inspiron 15R SE 7520 - Wireless Issue