Java Runtime Environment (JRE) 6 Update 21 - July 8, 2010

Download
http://java.sun.com/javase/downloads/index.jsp

Release notes
http://java.sun.com/javase/6/webnotes/6u21.html

Verify your version
http://www.java.com/en/download/help/testvm.xml

Note: Don't forget to uninstall the old one (unless it was uninstalled during the new install - New newer versions do that for you) and also UNcheck any unwanted toolbars/programs if offered.