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I need to update to the latest version of Java, but it tells me that Java has already been installed. When I try to reinstall it, it says that Java is not installed.

Revo Uninstall, CCleaner and manual removal all fail.

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Possible duplicate of Java Old JRE Installation Issue, jre1.7.0_11\java_sp.dll is corrupt what to do? etc. – Karan Jun 20 '13 at 21:59
Using programs like that it is no wonder you are having problems! – AthomSfere Jun 21 '13 at 3:08

Use JavaRA, to remove Java even if there are issues. It will even install the latest version automatically.

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