This was supposed to filed earlier after having it confirmed with Steve bohne and Bill Harnois
See Here :- http://javasoft4.india/Java_Install/bugs/jaws_registry_key_mail.txt

OS - Windows (ALL Versions )
JDK build - 83

1.Install JDK/JRE build 83 (snapshots shown are of installed JRE )
2. It will silently install Java Webstart 1.0.1_01 build 04
3. Following registry entries will be created
http://javasoft4.india/Java_Install/bugs/images/jaws_reg_after_installing.gif
4.Uninstall JRE and JaWS
5. See Registry here
HKLM->Software->Javasoft
http://javasoft4.india/Java_Install/bugs/images/jaws_reg_after_removing.gif

Java Web Start leaves an empty Key.
This key should be removed and installer should clean all the registry entries including empty values