Update to "Beware": (I do not find the "edit" function today, so I will reply to my own post) I was able to restore my netbook to normal functionality with System Restore. I do not understand exactly what this program did to my system, but it changed my WPA wireless network key and effectively disabled the network adapter on that computer. Simply changing the network key to the correct key failed to restore internet connectivity. A System Restore, however, fixed everything. (I don't think I need any more of that kind of "protection")