Wireless validating identity unable to find certificate
I thought that at first, perhaps, a virus and/or malware somehow got by and changed/altered the wireless settings, though the antivirus software and Malwarebytes software is up-to-date and is showing no problems. One of these may be doing strange things with the connection. If that does not work it could be a newtork card driver issue. However, before you do that I would advise you to make sure that you have the driver disc for that netcard (or for the notebook if it is an internal Wi Fi netcard), because Windows will often not have built-in drivers for any given netcard.
One way to restore networking, especially wireless, is to go into control panel, system and delete the network card. Since you mentioned that this notebook had previously been setup for multiple wireless profiles, my suggestion would be to delete all existing wireless profiles and see if that allows you to then create a new profile for the Comcast gateway.
The generic settings below will allow you to configure a wireless device to connect to eduroam.
Not all the configuration settings will be available on all devices.
Select Properties once you locate the wireless network causing the error.
Step 5 Select the Authentication tab and uncheck the Enable IEEE 802.1x authentication for this network box.
As of recently, she was able to use this computer to connect to a neighbor's/friend's secured wireless netowork and another neighbor's/friend's unsecured wireless network.
What's really strange, now I noticed, that this problem is occurring with any Network in range on the list. Without actually looking at the system, it is hard to tell exactly the problem but here are 2 general things to explore: Did you by chance install any of the Comcast utilities on her machine?
At the top of the screen, where it says, Choose a wireless network, I get an [endless] Validating identity.
This error is typically related to wireless network authentication and often appears because your Windows device is mistakenly searching for an 802.1x connection. Step 3 Right-click wireless network connection, then select Properties.
Step 4 Select the Wireless Networks tab, and then select the network from the bottom list.
I can't provide a screen shot to illustrate how to do that because I don't know if you are using the built-in Windows Wireless Zero Config, or a vendor specific utility for your unnamed Wi Fi card.
If that does not help, then consider uninstalling the Wi Fi netcard.