Firefox hangs when opening in Vista but this is a new problem

I am running Firefox 3.6 and Vista. My laptop is 18 months old and I have been using Firefox since day one. In the past week, Firefox has started to hang on opening. I takes as long as a minute to clear, and I don't have this problem with IE8 or AOL. Any help would be appreciated.
== This happened ==
Every time Firefox opened
== In the past week. No new downloads were made.

Firefox hangings are usually caused by conflicting extensions or addons. Go to '''Tools--Addons--Extensions''' and disable them one by one to figure out which one is causing it.

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Please scan with all programs because each program detects different malware.
All these programs have free versions.
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*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
*AdwCleaner: http://www.bleepingcomputer.com/download/adwcleaner/ http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
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*Microsoft Safety Scanner: http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: http://windows.microsoft.com/en-us/windows/using-defender
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Firefox hangs when opening in Vista but this is a new problem

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