Updating java in windows
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Versions other than the latest will not be removed as there are cases in which a user, particularly enterprise users, would need more than one version of Java on their systems. I've installed the 32 version and am using windows 7 x64. I've uninstalled all browsers, reinstalled them, removed older versions of java and the current one and reinstalled it.I've also been into the Java settings to ensure Mozilla is enabled. When loading the java splash screen shows and it looks like it will load, but then it fails, always with a Class Not Found Exception.While you are in here, you might want to take a look at the advanced settings.
Disable the new fancy plugin if your Java is not working in Firefox, and you can also disable the system tray icon if you don’t like it.
OS X users can also have multiple JRE versions available for desktop applications but only one of those versions can be used through the web browser.