Hello Gary and welcome to the forums
No worries, do you have access to the computer itself? What you've tried so far were great ideas, but we've been unlucky in this scenario, here's a few more things that I would try:
The first thing that I would like you to try is running this batch file: Flush DNS and restore HOSTS file.bat
It will completely reset the internet connection and clear the HOSTS file.
The second thing I would like you to try is to run a SFC scan: SFC Scan
- Open your start menu and in the search box, type Command Prompt
- When you see Command Prompt on the list, right-click on it and select Run as administrator
- When command prompt opens, copy and paste the following commands into it, press enter after each
Wait for this to finish before you continue
copy %windir%\Logs\CBS\CBS.log %userprofile%\Desktop\CBS.txt
- This will create a file on your Desktop called CBS.txt, please upload this to Mediafire:
Free Cloud Storage - MediaFire
This will check to see if any of the core Windows files are damaged.
The third thing I would like you to try is booting into safe mode with networking
(it sounds as if you know how to do this
But don't hesitate to ask if you don't know). Safe mode doesn't load any third party drivers or programs (including Norton!), so nothing external should be interfering with the networking - in essence, it will tell us whether the problem is hardware related, or somewhere further along the network chain.