Funny thing, I noticed that if I type in any random numbers/letters for other secured networks in the area, the same thing occurs. Well, she only has a laptop and likes to movie around.
She's always used wireless from the get-go, and in her particular situation/setup, where the cable goes to her entertainment center, it would be impractical to run an extension coax cable as well an an extension AC cord over to the modem.
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.
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?
Click on the Authentication tab and now uncheck the Enable IEEE 802.1x authentication for this network box.
Self-install kit included the ARRIS model TG 862G/CT Wi-Fi tower modem.
First box says Hardware enabling driver, second box says Software applications. I was happy to see that, when I accessed her wireless network, instead of almost instantly getting the [endless] certificate/Validating routine, I got that familiar opening of the box (Wireless Network Connection) with Type the key, and then click Connect. Disable the computer's wifi adapter and enable the ethernet port and reboot the computer. On the left side you will see "Change order of preferred networks" click on it.
As opposed to deletion and reinstalling, via the device manager, I figured I'd give it a try, updating the Broadcom 802.11b/g WLAN. After typing in the Network Key that is on the ARRIS modem, lo & behold, I got an [endless] Acquiring network address. This will get your mom on the interent and you can piddle around with the wifi access at some later time. Then find the network name, click on it, then click "Properties"Go to the second tab "Authentication"Unclick the box "Enable 802.1x authentication for this network"That should fix your problem You asked "why wireless"?
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error "windows was unable to find certificate to log on to the network" & showing validating identity.