Found this; "Try the following: First, click on the wireless icon in your taskbar and under Related Tasks, choose Change advanced settings. I just use a disc slip-streamed with a computers drivers. But if neither wired nor wireless works them you may have to bite the bullet.
Now click on the Wireless Networks tab and select the network in the list at the bottom. For Windows XP you do not need to boot from a USB drive. I have worked long hours on problems like this which only resulted in a System Reload to solve it.
I had an unsecure network connection so I changed the security settings of my tp-link router from WEP to WAP-TKIP. after that, i changed my network settings to the same WAP-TPIK option. It just says "validating identity" and does not ask for a passkey at all. thanks You want to make sure you are using the same version of WPA on each side.
Click on the Authentication tab and now uncheck the Enable IEEE 802.1x authentication for this network box. 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.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.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 did bring over my all-in-one desktop yesterday and checked the direct connection, the Ethernet connection, and at least that works fine.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?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.Secondly you can change the SSID to what you want, and the channel to 1 or 11.Then if your operating system is windowsxp please follow the attachment to have a try.(they sent me a file attachment with the email) If your operating system is vista please refer to https://I moved the selection tab to WPA2 only and keep the rest the same and no luck. Ok so I setup the router to only transmit wireless N and to use WPA2 only.I moved the selection tab to WPA2 only and keep the rest the same and no luck.