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Newest version of Firefox for Windows will not install.

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After the auto update of Firefox failed to work, I downloaded the full installation file for the most recent version of Firefox (28.0). The setup file extracts but doesn't install. I also cannot find the extracted file(s) on my computer. I have tried uninstalling older versions, running antivirus, anti-rootkit and malware programs and also disabling those programs before trying to install. Any other suggestions I can try?

After the auto update of Firefox failed to work, I downloaded the full installation file for the most recent version of Firefox (28.0). The setup file extracts but doesn't install. I also cannot find the extracted file(s) on my computer. I have tried uninstalling older versions, running antivirus, anti-rootkit and malware programs and also disabling those programs before trying to install. Any other suggestions I can try?

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Download and save the full Firefox installer from here :- http://www.mozilla.org/en-US/firefox/all.html