Hi cms,
please check the following location : jboss-5.0.1.GA/server/default/data/birt. can you find the files : overall_activity.rptdesign and process_summary.rptdesign?? If not then your installation was not successful. You ll have to set "jBPM.birt.download" as true in build.properties and then run install.demo again.
regds.