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Having problems after updating to Mozilla Firefox 4.

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After I updated to Mozilla Firefox 4, I get a message when trying to access a website. Example: "Windows cannot find http://www.yahoo.com" -----make sure you typed the name correctly-----. After the message, the webpage loads.

I would like to go back to Firefox 3. How can I do this?

After I updated to Mozilla Firefox 4, I get a message when trying to access a website. Example: "Windows cannot find http://www.yahoo.com" -----make sure you typed the name correctly-----. After the message, the webpage loads. I would like to go back to Firefox 3. How can I do this?