Build tested: j2re1.5- build 31 and build 32
OS tested: XP-Home/ XP-Pro/ win 2000 pro/ ME

Steps to reproduce:
------------------
1) Install j2re1.5-b32 onto the test system
2) Un-install j2re1.5-b32 from the test system
3) Install j2re1.5-b31 onto the test system

At this point, the test system shoud have j2re1.5-b31. Doing the java -version / java -fullversion should indicate so

Problem: Can not lauch the java control panel
 
either through Start --> Settings --> Control Panel (click on Java icon)
or execute C:\Program files\Java\J2re1.5.0\bin\javacpl.exe

Error Message: Java Virtual Machine Launcher
               Could not find the main class. Program will exit

Also, when trying to remove j2re1.5-b31 from the system (via Add/Remove program)
the fatal exception orrurred

Error Message:
Java Virtual Machine Launcher
Fatal exception occurred. Program will exit

Java(TM) WebStart1.5.0-beta
Bad installation. Error invoking Java VM (execv)
C:\\Program Files\Java\j2re1.5.0\bin\javaw.exe

Please fix it as this is a very common problem for users as build 31 is available from earlyAccess site.