This Forum Beta is ONLY for registered owners of D-Link products in the USA for which we have created boards at this time.
On your router change the wireless mode from N to B and G some pda devices are not compatible with it and make sure the channel on router is under channel 6 , also please make sure the wireless mode is under infrastructure as well .If this does not work any better please reply.
I've encountered this when I was setting up my own router. Turned out that my PC did not have Microsoft's WPA2 update. Once this WPA2 update completed, that warning disappears.Look for it here: http://support.microsoft.com/kb/893357