Latitude 610 Cannot Connect To DLink DIR-625

Hello,

I have had a similar problem with several laptops. It may be the fact that the DLink Router (Model DIR-625) is a new technology but it is supposed to be backwards compatible. All of my older Toshiba laptops can connect to it at 54MBPS but the IBM T42 cannot. The Dell Latitude 610 can scan, see it, and attempt to connect but it doesn't ever connect. I tried downloading the newest Dell Driver that had "upgraded interoperability" but it didn't work. Anyone have any ideas? I know the router isn't set for Wireless N only since all of the old laptops are connecting at Wireless G. Thanks!