You've done everything I would have suggested, so all that's left as a quick test is to try Firefox's Safe Mode.
Have a look at http://support.mozilla.org/en-US/kb/Safe%20Mode for the new methods to do that. Then test Google's links to see if they now work.
The google.ca site opens fine and responds to the initial search query, but the links to each article found do not open when click. It's as if they are not hyperlinked. No visible evidence of the browser searching for that clicked link at all. Just sits there and does nothing.
If you right click the link and open in IE window, that works, as does searching Google.ca in IE alone.
I've run AVG and Mbam with no negative results.
My Hosts file does not contain any link to google.
I've shut down all add-ons in Firefox with no results.
I disabled AdBlock in Firefox with no results.
I rebooted the system just for luck but didn't have any.
Has anyone else experienced this?
Using Windows XP Pro.