Starting from 6u10 b05, I noticed if you install the JRE on a Windows Vista 64 AMD machine that the Java Control Panel(JCP) does not appear in the Windows Control Panel.  The JCP does however appear there when using 6u10 b04.
Posted Date : 2008-03-27 01:33:42.0

Launch the control panel from the taskbar icon, or by running "javaws -viewer"

This problem was introduced by the fix for 6485081 in 6u4 b03. 
In that fix, we no longer copy our javacpl.cpl into the windows system32 directory in order to avoid the Program Compatibility Assistance (PCA) dialog upon exiting the Java Control Panel. That fix also creates javacpl.exe and registers it accroding to MSDN documentation. Apparently, it doesn't work well on Vista 64-bit.
Posted Date : 2008-03-19 17:21:00.0

This fix places the 32-bit Java Control Panel icon under the "View 32-bit items" area of windows control panel on a 64-bit Vista machine. The fix is suggested by a Microsoft support engineer who has also filed a MSDN documentation bug after this investigation. Currently, this solution isn't described in MSDN yet.

The registry key which makes the difference is:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersionxplorer\ControlPanelWOW64
(Note the "WOW64" appended to "ControlPanel")

Tested the co-existence of both 32-bit and 64-bit Java Control Panel.
Also tested when both 32-bit and 64-bit JREs are on the same machine, uninstalling one JRE doesn't remove the Java Control Panel for the other.
Posted Date : 2008-05-13 19:04:10.0

will this be fixed in 6u10 too ?

will this be fixed in 6u10 too ?

This issue is still present in Java 6 update 6 under Windows Vista 32-bit: Java icon in Control Panel on Vista as default, except we switch it to classic view. Java Control Panel is NOT listed under "Additional Options"

This issue is still present in Java 6 update 6 under Windows Vista 32-bit: Java icon in Control Panel: we can't find Java icon in Control Panel on  Vista as default, except we switch it to classic view. Java Control Panel is NOT listed under "Additional Options"

On Windows Vista 32-bit, the Java Control Panel is accessible from either the "Classic View" or from the "Programs". It is not listed under "Additonal Options".

Regarding the issue on Vista 64-bit, we'll have a fix in 6u10.

Come n guys...fix this bug.

64 bit computing is the way of the future!.

I've got the same problem with Windows XP Pro x64 SP2