It sounds like the Java control panel applet (javacpl.cpl) is missing from your %SystemRoot%\system32 folder. To fix this you can enter the following command at a command prompt:
copy %ProgramFiles%\Java\jre7\bin\javacpl.cpl %SystemRoot%\system32
That will copy the javacpl.cpl file from the Java installation folder to the system32 folder, thus restoring the control panel applet functionality. Scott.