On the first tab, which should be labeled Association, change the network authentication to WPA2-psk, leave the data encryption as AES (though if AES doesn't work try the TKIP).
Enter in the network password in both fields and hit OK.
I am using the Windows Wireless Connection Manager. On a couple of occasions I've seen that particular AP (don't know what firmware) suddenly stop attempting to authnenticate clients (it never sends any RADIUS requests) and power-cycling the AP "fixes" the issue.
I suspect a firmware upgrade probably fixes that behaviour.
WPA2 is supported as i can connect to WPA2 personal APs. During the connection it flashes that it "connected" for a second then goes to "Validating Identity" which it eventually timesout on.It took a try or two for the computer to connect with the network so be patient.This process worked on an old compaq presario m2000 with a new linksys E2000 router. The first thing that I would try is to open your device manager and left click the next to the network adapters tree to expand it.Although far from the cheapest option it did appear to be the best wireless router out there, so I asked Father Christmas nicely and that's what I got.I only had it a week when I started noticing problems, the main one being that the ADSL internet connection just drop, 2-3 times a day.If anyone can help me ASAP, I'd be extremely grateful.