Fred,
Check your HOSTS file. Usually located in the 'etc' directory of
'windows\system32\drivers'
Remove 'read only' (right-click | Properties), click APPLY | OK.
Open in Notepad & check to see if you have only one entry:
localhost 127.0.0.1
If not, back up the contents, change to the above entry & then save the file.
Now, retry the Internet
Please post back