Latitude D820 unable to connect to MS Broadband MN-610

Hi ... I have a couple of notebooks that I won't connect to an MS
MN-610/M-620 wireless b broadband router. Other brands of laptops can
connect to the router and the two laptops (Dell Latitude D820 & D610
both have an Intel 3945 wireless G built-in) connect fine to wireless G
routers. I checked the settings on both the router and on the laptops.
I changed the SSID, changed the WEP, disabled the WEP, changed
channels, all of those types of things. The notebooks can see the
router, but cannot acquire an IP from the router.

Thanks,
Jay