Please read http://forums.cnet.com/5208-4_102-0.html?threadID=377411
At least one member fixed it and while I wish they had followed the CNET Networking Forum preferred solution, at least they are up and running.

If you follow them they went from WEP to none to WPA. There could be other issues such as too far away from the router but WPA2 can be problematic on some gear and the other issues about MAC FILTERS and hiding the SSID which is not suggested yet people try that (and fail.)
Bob