The reason you would want to uninstall JVM is because it is now unsupported by Microsoft due to a legal dispute between SUN and Microsoft and the outcome of that was that Microsoft may not even supply security updates for their JVM.
Instead it is recommended that you install the latest version of [URL=http://www.java.com/en/download/manual.jsp]Java Runtime Environment (JRE)[/URL] from SUN and update it whenever SUN releases updated versions.
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