I had TKIP and AES as options there, but cipher type is AES on the router, so I chose that.
When I try to connect using the windows zero configuration utility it gets stuck validating identity.
It says something about windows not finding a certificate.
First, click on the wireless icon in your taskbar and under Related Tasks, choose Change advanced settings.
Now click on the Wireless Networks tab and select the network in the list at the bottom.
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.If the box was checked, then that was why you were getting the “unable to find a certificate to log you on to the network” message because Windows is looking for one, but your wireless router is not setup for certificate security. Once I unchecked that box and tried to reconnect to the wireless network, everything worked fine! The below guide has been tested on MS Windows XP Professional and is based on Windows' default wireless configuration tool (Wireless Zero Configuration).After about 30 minutes of fiddling around with various settings, I was able to figure out what the problem was.Here’s how to connect to your wireless router if you are getting this message. = If the eduroam network does not show up, click on Refresh network list.