Firefox 3.6.9 doesn't open but is running in task manager

I received Animalware via µTorrent and was very busy cleaning up. I changed from AVG (because it let it slip by) to Avira Anti-Vir, ran MalwareBytes Anti-Malware, among other threat removers. In the beginning, none of the current browsers, as well as Outlook Express, were able to connect, but as I progressed with the cleaning operation, IE, Chrome, Safari & Outlook Express were able to connect. Firefox still doesn't open and displays no errors, but runs in Task Manager using 95% of the CPU. I am also running online scans from Trend Micro, Panda and bitDefender. Meanwhile, if anyone has any other suggestions, I would be very thankful.

Make sure that you do not remove your personal data when you uninstall Firefox. Then you won't lose personal data stored in a different location in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder].
See also http://kb.mozillazine.org/Profile_backup and [[Backing up your information]]
A possible cause is security software (firewall) that blocks Firefox.<br />
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox.<br />
See [[Server not found]] and [[Firewalls]] and http://kb.mozillazine.org/Firewalls
See also http://kb.mozillazine.org/Browser_will_not_start_up
Do a malware check with a few malware scan programs.<br />
You need to use all programs because each detects different malware.<br />
Make sure that you update each program to get the latest version of the database.<br />
*http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
*http://www.superantispyware.com/ - SuperAntispyware
*http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
*http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
*http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and [[Searches are redirected to another site]]

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