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.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! To fix, you go into the properties page of your wireless connection, go to "Wireless Networks" tab and then to Properties of the chosen wireless network you are trying to connect to.
I had been able to connect previously, but the connection would always indicate that it was validating.
It says something about windows not finding a certificate.