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when double clicked, firefox 3.6.3 setup does not start (subsequent to uninstalling very old release)

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I uninstalled a old release of Firefox and rebooted the system theb downloaded 3.6.3 to the desktop and double clicked it. Nothing happens.

I attempted to install the latest version

User Agent

Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 1.1.4322; .NET CLR 2.0.50727)

I uninstalled a old release of Firefox and rebooted the system theb downloaded 3.6.3 to the desktop and double clicked it. Nothing happens. == I attempted to install the latest version == == User Agent == Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; .NET CLR 1.1.4322; .NET CLR 2.0.50727)

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Try to disable your anti-virus software during the installation to see if that helps.

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Thanks for the suggestion. I ended up using Live Chat and was walked through a workaround to the automated setup.