I downloaded Firefox 4.0 and now it's not working

Two days ago, I downloaded Firefox 4.0 like the browser prompted me to. Right after the update, I was unable to connect the internet. The page displays the message, " Firefox uses a proxy server that is refusing connections". I don't have a Mac, just Windows. I called my internet provider and we tried uninstalling 4.0 and reinstalling the older version - nothing. We tried installing internet explorer - nothing. I tried unplugging my router and plugging it back in - nothing. I really think this is a problem with Firefox because everything was fine until I installed 4.0. Now I really wish I hadn't.

You're trying to go through a proxy which isn't working. Assuming you don't normally use a proxy to connect to the internet, do this:
Tools, options, advanced, connection settings, set no proxy.
Causes for this may include anything which monitors or forwards newtork traffic on your computer (tools like fiddler2 or tor). It may also be that you are on a network which requires a proxy to access the intenet (some corporate and university networks do this).
--dave

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I downloaded Firefox 4.0 and now it's not working

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