Here we go again!

If you haven't disabled the Java plugin in your browser (and some email clients), this is a good time to do it, before you get hit with something nasty like ransomware.
http://www.java.com/en/download/help...le_browser.xml

If you're still running an older version of Java and don't have the master kill switch described in the link above, upgrade first.

Note that disabling the java plugin is different from disabling java. The launcher should still work.