Scenario 1) Correct behaviour
--> Install 1.6.0 JRE (Just keep on pressing
  enter, i.e. non-custom at default location)
--> Install 1.5.0 JRE (Just keep on pressing
  enter, i.e. non-custom at default location)
--> Now check for following four keys:
  a) HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{08B0E5C0-4FCB-11CF-AAA5-00401C608501}\TreatAs Value: {CAFEEFAC-0016-0000-0000-ABCDEFFEDCBB}

  b) HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\AdvancedOptions\JAVA_SUN\SELECT\RegPath
  Value: Software\JavaSoft\Java Plug-in\1.6.0

  c) HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\AdvancedOptions\JAVA_SUN\SELECT\Text
  Value: Use JRE 1.6.0 for <applet> (requires restart)

  d) HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Extensions\{08B0E5C0-4FCB-11CF-AAA5-00401C608501}\ClsidExtension
  Value: {CAFEEFAC-0016-0000-0000-ABCDEFFEDCBC}

Above values are exactly what we expect and correct behaviour,
Now consider

Scenario 2) Incorrect behaviour
--> Install 1.6.0 JRE (Just keep on pressing enter, i.e. non-custom at default location)
--> Install 1.5.0 JRE (Choose custom installation and give location c:\temp\jre)
--> Now check for following four keys:
  a) HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{08B0E5C0-4FCB-11CF-AAA5-00401C608501}\TreatAs Value: {CAFEEFAC-0015-0000-0000-ABCDEFFEDCBB}

  b) HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\AdvancedOptions\JAVA_SUN\SELECT\RegPath
  Value: Software\JavaSoft\Java Plug-in\1.5.0

  c) HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\AdvancedOptions\JAVA_SUN\SELECT\Text
  Value: Use JRE 1.5.0 for <applet> (requires restart)

  d) HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Extensions\{08B0E5C0-4FCB-11CF-AAA5-00401C608501}\ClsidExtension
  Value: {CAFEEFAC-0015-0000-0000-ABCDEFFEDCBC}

Now these key values are NOT expected and wrong,
One implication I can see is that IE start using
older JRE.

Exactly similar is the scenario for reproducing bug
 with 1.5.0 --> 1.4.2_05 and above 4 keys
are only affected in this case
also(Only difference is text is change for different version)

As per discussion with Bill, Intaller should either:
--> Warn that you will be overriding newer version
--> Or by default we uncheck the checkbox for browsers
    going to have that plugin(This sounds little misleading
    as user should be informed)

###@###.### 2004-09-03