Close any programs you may have running – especially your web browser.
Go to Start > Control Panel double-click on Add/Remove programs and remove all older versions of Java. Here are a bunch of examples of how older versions may appear. Uninstall all of these if found:
IBM 32-bit Runtime Environment for Java 2, v1.4.2
Java Runtime Environment 1.1
Java 2 Runtime Environment Standard Edition v1.3.1_02
Java 2 Runtime Environment Standard Edition v1.3.1_04
Java 2 Runtime Environment, SE v1.4
Java 2 Runtime Environment, SE v1.4.2_01
Java 2 Runtime Environment, SE v1.4.2_03
Java 2 Runtime Environment, SE v1.4.2_05
Java 2 Runtime Environment, SE v1.4.2_06
J2SE Runtime Environment 5.0
J2SE Runtime Environment 5.0 Update 1
J2SE Runtime Environment 5.0 Update 2
J2SE Runtime Environment 5.0 Update 4
J2SE Runtime Environment 5.0 Update 5
J2SE Runtime Environment 5.0 Update 6
J2SE Runtime Environment 5.0 Update 7
J2SE Runtime Environment 5.0 Update 8
J2SE Runtime Environment 5.0 Update 9
J2SE Runtime Environment 5.0 Update 10
J2SE Runtime Environment 5.0 Update 11
Java(TM) SE Runtime Environment 6
Java(TM) SE Runtime Environment 6 Update 1
Java(TM) 6 Update 2
Java(TM) 6 Update 3
Java(TM) 6 Update 4
Java(TM) 6 Update 5
Java(TM) 6 Update 6
Java(TM) 6 Update 7
Java(TM) 6 Update 8
Java(TM) 6 Update 9
Java(TM) 6 Update 10 thru Update 17
Click the Remove or Change/Remove button.
Repeat as many times as necessary to remove each old Java version.
Reboot your computer once all Java components are removed.