Java (TM) in Windows

My pc runs on Windows XP Tiny. In my "Add/Remove" I find :

1... Java (TM) 6 update 3 ..............111 MB

2... Java(TM) 6 update 4 ..............137 MB

3... Java(TM) 6 update 5 ..............114 MB

Please tell me if it would be alright to delete/uninstall the first two items

and have the last item and continue to enjoy whatever all three of them

were providing me.

As you can see by doing that I could save 248 MB of space.

And what exactly Java does for me, being in my pc?

For one, I see Java coming on when I open 'certain' Chess sites. Not all.

Thank you.