I recently set up a wireless network for my new Sitecom WL-585 modem router with WPA-2 security and all went according to plan. I have a Win 7 laptop, Vista laptop, XP laptop, Nokia N95 and Soundbridge all connected.
I am fast running out of ideas and wonder whether the laptop's wireless capabilities simply aren't up to it?
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!
I cannot get WPA2 enterprise to work on my network. Windows Domain, using IAS and its own CA Linksys WAP200 Access Point I setup the AP to use WPA2-Enterprise Mixed using RADIUS I setup and registered IAS on the domain controller.
For detailed information about a Windows-based authentication infrastructure, see Wireless Deployment Technology and Component Overview.
For detailed information about how to deploy a wireless LAN using IEEE 802.1X authentication, see Deployment of Protected 802.11 Networks Using Microsoft Windows.