I had been able to connect previously, but the connection would always indicate that it was validating.
However, it didnt work, until I disconnected, turned the power off my Wi Fi, unchecked the tab in the authenticate dialog box, clicked ok, then switched the Wi Fi power back on, and reconnected.
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.
If your network is Encrypted go on to step 6 otherwise Click ok and try to connect to your network again.
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.
Screenshots are taken from Professional version thus may slightly differ from other versions (e.g.
Home Edition, etc.): You have now succesfully configured Windows XP to connect to eduroam network.
However, you may have to go into "view wireless networks", and then choose "change order of preferred networks" in left corner of screen.
I suspect a firmware upgrade probably fixes that behaviour. If you want to accept both computer credentials and user credentials you'll need to name both "Domain Comptuers" and "Domain Users" in your policy.
By default, XP will re-authenticate with the user credential after the user logs-on (there is no way to do computer-only with XP, I believe).
Now click on the Wireless Networks tab and select the network in the list at the bottom.
Click on Properties once you select the wireless network that is having problems.