How many versions do I need?

Hi, please help.
I am a regular Windows XP user without any technical knowledge.
My computer has a number of Java versions under C:\Program Files\Java\ which, in total, use almost 0,50 GB.
I wonder if I need all of them. If not, do I keep only the last one? How do I know which one(s) I need?
And then, if I can uninstall any of them, how is it done? I can't see any uninstall file.
Thank you. Appreciate your help,
spj
Just in case, the versions are jre1.5.0_01, _03, _04, _06, _09, _10, _11, plus
j2re1.4.1_02 and 1.4.2_04

Some programs are written so that they require a certain Java version, most will work with the most current version. Only you will be able to make this determination for the programs that you have.
Unless you require older versions, the last one is adequate. Versions can be uninstalled using Windows' Add/Remove Programs applet. It's a good idea to remove in reverse order of the install order. If you uninstall all Java versions first, then it's safe to manually delete any leftover files or directories; then reinstall the newest Java.

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