Two versions of jdk and RTE on the same computer

When Installing j2sdk1.4.1_01 I had not uninstalled jdk1.1.8 believeing that the new version would overwrite the old one.
But instead it installed alongside the old one.
I now have both showing up in the Cintrol Panel/Programms and I have two relevant folders on w2k drive.
Might the collide?
I was about to remove jdk1.1.8, but noticed that it takes 28.1 Mb whereas j2sdk1.4.1_01 is only 1.88 mb - perhaps j2sdk1.4.1_01 uses some files from the old one, and removing the old, I disable the new one?
The same about Java 2 RTE: I have both v.1.2.2 (19MB) and 1.4.1_01 (1.6 Mb)
What would you recommend?

Thanks, sounds like a good idea.
I uninstalled all the versions of JDK and of RE and re-booted the PC as prompted.
Question: folders j2sdk1.4.1_01 and jdk1.1.8 are still there - should I remove them manually?
Before reinstalling JDK and RE, I run an ASP page with a java-applet, sitting on my PC. As expected, the applet was shown as an empty rectangular.
However, when I accessed a similar page on the Internet, the applet there was working fine.
I was dead sure that the applet is executed on the client computer and that computer heeds RunTimeEnvironment which I uninstalled.
In any case all the applets should either work or not work, nomater whether they are sitting on my local drive or downloaded with a page from the Internet.
I feel I am missing something. Could you provide further comments?
a
PS. I have multiple partitions on that disk with two other OS - can this be a cause?
When RE is installed, which folder and where to is added?

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