Wireless no longer working -- "no connections are available," but hard

Hi all, I'd call myself a decently tech-savvy person, but this one has me stumped. Any help would be appreciated! *Laptop:* Dell Latitude D630 running Windows 7 Professional, SP1. *Problem:* Despite the presence of available WiFi connections, the system states "There are no connections available." WiFi works when booting in Safe Mode with Networking. The laptop also connects fine when...