When I plug the comp into a wired network, it works perfectly.
The computer had been running Norton ISS, but it had expired so I yanked it out using a removal tool. I also ran the McAfee removal tool just in case that might have been installed before and not been uninstalled properly. I installed CA anti-virus/anti-spyware, and the AV picked up a couple infections that it cleaned. By all rights, this computer should be online with the wireless, unless maybe the USB device itself isn't working right, but everything shows up properly in the Device Manager.
Now, this computer uses AT&T Communication Manager to manage the wireless networks instead of the Windows utility. I've been getting errors that this has expired. Could this be causing the problem?