Java - Error al Instalar Sun Java System App Server

Alguien podría orientarme? Tengo el siguiete error al tratar de instalar el servidor web:

INFO - Start Sun Java System Message Queue configuration
INFO - End Sun Java System Message Queue configuration
INFO - unpacked jar file: C:\Su\AppServer\lib\admin-cli.jar.pack.gz
INFO - unpacked jar file: C:\Su\AppServer\lib\appserv-cmp.jar.pack.gz
INFO - unpacked jar file: C:\Su\AppServer\lib\appserv-deployment-client.jar.pack.gz
INFO - unpacked jar file: C:\Su\AppServer\lib\appserv-ext.jar.pack.gz
INFO - unpacked jar file: C:\Su\AppServer\lib\appserv-jstl.jar.pack.gz
INFO - unpacked jar file: C:\Su\AppServer\lib\appserv-rt.jar.pack.gz
INFO - unpacked jar file: C:\Su\AppServer\lib\appserv-tags.jar.pack.gz
INFO - unpacked jar file: C:\Su\AppServer\lib\appserv-ws.jar.pack.gz
INFO - unpacked jar file: C:\Su\AppServer\lib\com-sun-commons-launcher.jar.pack.gz
INFO - unpacked jar file: C:\Su\AppServer\lib\j2ee-svc.jar.pack.gz
INFO - unpacked jar file: C:\Su\AppServer\lib\javaee.jar.pack.gz
INFO - unpacked jar file: C:\Su\AppServer\lib\sun-appserv-ant.jar.pack.gz
INFO - unpacked jar file: C:\Su\AppServer\lib\deployment\sun-as-jsr88-dm.jar.pack.gz
INFO - Start core server configuration.
ERROR - default domain creation returned following exception: abnormal subprocess termination: Detailed Message:La sintaxis del comando no es correcta.

La sintaxis del comando no es correcta.

INFO - End core server configuration.
INFO - Start samples configuration.
INFO - End samples configuration.
INFO - Start Java DB Configuration.
INFO - End Java DB Configuration.

....
More Information:
Log File: C:\Su\AppServer\Install_Application_Server_9PE_200705080822.log

¿Y has probado a mirar en C:\Su\AppServer\Install_Application_Server_9PE_200705080822.log para ver más información del problema?

Ya me ha pasado, cuando uno no desinstala correctamente una version anterior o la mísma.Lo más sencillo es instalar el sistema en otro directorio, p.ej. C:/Sun/AppServer9/