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So I finally called my sister-in-law, Joan Childs. Well...actually, Joan is my brother-in-law Carl's wife; is she still my sister-in-law? No matter, she's a freelance computer consultant and probably the brightest bulb in the whole family. She's a sweetheart, too, and just dove right into the problem. And after three downloads, and a lot of "No, I tried that" and "Holy crap, I can connect to the neighbor's Linksys network but not my own!", she got me hooked up. Turned out there had been a Dell upgrade in the driver for my WLAN card to handle a Windows upgrade that dealt with the security layer on top of TCP/IP. She sent me a link, I downloaded it, and I was writing this post within five minutes. Thanks, Joan!