CAN'T UNINSTALL JAVA PLUG IN 1.4.0_01

New to Java. I just installed the new J2SDK 1.4.1-rc. I (thought) I uninstalled the previous JDK/JRE (1.4.0), but apparently I didn't. Now, the files are gone, but I can't get rid of the Java Plugin icon and, more importantly, I can't associate executable jar files with the javaw.exe command.
I fear I deleted the files manually and I don't know what registry settings to change and how to make it associate javaw.exe with .jar files.
I am on a Windows XP machine.
Any help is appreciated!
Thank you,
Sam

Change:
HKEY_CLASSES_ROOT\Applications\javaw.exe\shell\open\command
(Default) "C:\Program Files\Java\j2re1.4.0_01\bin\javaw.exe" -jar "%1"
Edit to suit you JRE's home.

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