I am fast running out of ideas and wonder whether the laptop's wireless capabilities simply aren't up to it?
I'm currently doing a spare-parts build to put a media computer in the living room, and having a devil of a time getting my Rosewill RNX-6300 wireless card to connect to my network.
I then tried installing the supplied Sitecom N adapter, after some problems the network appears but I can't connect, I am told "Windows was unable to find a certificate to log you onto the network" I read several threads that led me to uncheck "Enable IEEE 802.1x authentication for this network" and I actually managed to enter the WPA2 code but this just leads to the message "This connection has limited or no connectivity" and "validating identity".
I added the AP as a client with and have tried using both RADIUS Standard and Cisco as the RADIUS type.
In order to configure the connection back to Automatic, edit the eduroam profile, go to the Connection tab and check Connect when this network is in range: Figure 14: Setting Automatic connection  = If the Wireless Network Connection icon is not present, this may be due to the wireless network manager of your vendor's card taking over from Windows' built-in one (Wireless Zero Configuration).
Please refer to the documentation of your vendor's card in order to turn it off as this may interfere with the procedure here documented.
In a few simple steps you can bypass Windows Validation, and the resulting "Limited or No Connectivity" issue on an encrypted connection.
In the next window click on the "Authentication" tab, Make sure "Enable IEEE 802.1x...." checkbox is UN-Checked, the rest of this window should be greyed out.