I have a user with this same issue - he's got a brand new Dell laptop that is able to detect all nearby wireless networks except one. And of course this is the one he needs to access. Other users are able to connect to this network so it is clearly broadcasting (plus I've confirmed this on the WAP control panel). I've tried updating the drivers, rebooting, running Windows and Dell updates, and adding the network manually (at which time it appears under Manage Wireless Networks but he still can't connect to it). Does anyone have a fix for this?