JAVA RUNTIME SE

I have a Dell Inspiron B130 and while doing a clean up, noticed that I have 4 versions  and or updates(not sure if I should call it that) and each takes up over a 100MB. Do I need ALL of it? And if I was to remove one or more, how does one knows which to keep?

I would appreciate any input on this matter.

- Using Windows XP

Java installed:

1)J2SE Runtime Environment 5.0 Update - 119MB

2) Java 2 Runtime Environment SE vl.1.4.2_03 - 136MB

3) Java(TM) 6 update 2 - 111MB

4)Java(TM)SE Runtime Environment Update 1 - 134MB

*Running out space with so many "Runtime":smileyhappy: