Install JDK over Runtime Environment

Hello,
This is a really stupid question but the last time I downloaded the JDK there was no such thing as the runtime environment. It's been a long time on that computer. I have a new computer and want to put the JDK on it. When I run java -version, I get :
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\HP_Owner>java -version
java version "1.6.0_07"
Java(TM) SE Runtime Environment (build 1.6.0_07-b06)
Java HotSpot(TM) Client VM (build 10.0-b23, mixed mode, sharing)
So I downloaded the latest JDK but when I went to erase what I thought was the basic run time environment, Windows Add or Remove Programs listed J2SE Runtime Environment 5.0 and 3 Java Updates 3, 5, and 7.
So just to make sure, the Java updates are for the Runtime Environment and I need to remove then all in order to install the JDK? If so, do I remove the Updates in reverse order, then the runtime environment?
Or can I install the JDK alongside the Runtime Environment and then tell which one is to be activated when a command like javac x.java is entered and give the JDK path preference?
Thank you
Philip

There might be some connection or transfer error during the J2 installion but it shouldn't require a reboot. I'm a N6.1 user with Win2k Pro. Try reinstall the n6.1 and download the JVM pack at netscape update center.

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