No matter what I do, I cannot update from 3.?.? to 8.?.? I've tried everything suggested but it will NOT update now I cannot open many new websites

Cannot update Firefox from 3.6.3 to 8.0
I've tried repeatedly to do this but it will not load up.
Now I cannot open new websites.

What happens when you download and run the installer? (http://www.mozilla.org/en-US/firefox/new/)
Are you really running 3.6.3? You should update to 3.6.24 ASAP - http://www.mozilla.org/en-US/firefox/all-older.html
Your user agent string may just be set incorrectly. See below
* Type about:config in the URL bar and hit Enter
* If you see the warning, you can confirm that you want to access that page.
* Filter = general.useragent.
* Right-click the preferences that are bold, one line at a time, and select Reset.
* Then restart Firefox

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