I purchased a new Airport Extreme wireless router and successfully got connected to my Macbook for in home use. I have a Dell Dimension 4700c desktop with an airport card and wireless Dell USB adaptor which was successfully operating using a 3 year old D-Link wireless router. The Dell will not recognize the new Airport Extreme. I have tried to change the channel of the Airport, tried renaming the network, unplugging and resetting the cable modem, unplugging the cordless phone to no avail. The interesting thing is that the Dell recognizes other networks in my neighborhood(and even allows poor connectivity at times) but not my own Airport. Dell won't provide any help since the unit is out of warrranty. All suggestions would be greatly appreciated.