I downloaded Firefox 3.6.3 and now Mozilla won't start at all. What happened?

I downloaded Firefox 3.6.3.exe, opened it, it appeared on my Start menu. I click the icon there and nothing happens. Absolutely no connection.
== I downloaded from the Mozilla home page this a.m. ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.0.3705; .NET CLR 1.1.4322; .NET CLR 2.0.50727; Media Center PC 4.0; WWTClient2; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

Hello.
Hopefully this support article is what you need:
https://support.mozilla.com/en-US/kb/Firefox+will+not+start

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