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Here is the link for the Java update (JRE download on the right side of the page - suggest to do it OFFline) http://www.oracle.com/technetwork/java/javase/downloads/index.html.
Make sure you uninstall previous versions of Java after you download the new version but prior to installing the new version http://www.java.com/en/download/uninstall.jsp, then reboot your machine.
Next install the new version of Java, then reboot again.
To make sure you are current with your software, I suggest you run a free Secunia Software Inspector http://secunia.com/vulnerability_scanning/personal/. This site will give you the direct download link from the vendor if an upgrade is needed saving you time. Most of us here scan our machines weekly since software changes so often.
Let us know if you have any questions. Thank you.