Could you try installing a 64 bit JVM, changing your JAVA_HOME to the new one, removing the service (use install_service with uninstall) and trying again? Be sure to uninstall the service before you try with a different version.
It is my understanding that the JavaService architecture needs to match the installed Java one, so please try with 64 bits for both.
Also, please check if you have a file called out.txt or err.txt in your ../bin/ folder, it main contain more info.
More info about the JavaService software itself can be found here:
http://javaservice.ow2.org/index.htmlRemember, if you are going to try with different versions of the JavaService exe file you need to uninstall the service first and install it again each time.