Latitude D430 wireless card not detecting wireless-N

Hi,

I am planning on upgrading my small business network from wireless-G routers to wireless-N. I've tried connecting to the router (which has been setup) and I can see the 2.4Ghz connection (G) but the 5.0Ghz connection (N) does not show.

Other computers on my network equipped with wireless-N network cards have no problem detecting this network. The latitude D430 is supposed to be equipped with an n draft network card but I can't seem to get to work properly, even though all drivers are up-to-date.

Thank you