Can't upgrade to JRE 1.6 from 1.4.2

For the life of me I can't get my JRE upgraded. I've ran JDK6u21 and nothing, re-installed and nothing, tried JRE6u21 and still

java version "1.4.2_06"Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_06-b03)Java HotSpot(TM) Client VM (build 1.4.2_06-b03, mixed mode)

Any suggestions? Can I force to 1.6? The 1.6 directory is in my path, don't even know where 1.4 is.