How to reproduce:

1. Obtain the latest JDK 1.6.0 B61 from \\koori\onestop\jdk\6.0\latest\bundles\windows-i586 2. Complete the installation

3. Go to c:\Program Files\Java\jdk1.6.0\lib
4. Invoke the following command "java -jar jconsole.jar" or invoke other JAR applications.
5. In a command prompt, invoke "ps -ef | grep java" to ensure the java process related to the JAR application can be discover.

Try using 'jps' to do the same ...
6. Go to c:\Program Files\Java\jdk1.6.0\bin
7. Invoke "jps" and no java process can be seen.

Note: please see attached .png files for more details
The Windows file systems of the machines are NTFS, and they are not full.
Please see, http://java.sun.com/j2se/1.5.0/docs/guide/management/faq.html#win1
The problem was reproducible in b61 and a few builds after that, but it was not reproducible in the build 75.