Have a look at http://wrapper.tanukisoftware.org/ or http://www.multiplan.co.uk/software/javaservice/

use javaservice
www.alexandriasc.com/software/ JavaService/download.html

instructions:
http://jboss.org/wiki/Wiki.jsp?page=RunJBossAsAServiceOnWindows

note: if your log folder, and stderr.log and stdout.log files under c:\jboss\server\default is not created then service will start and promptly stop. - create these manually first and should be fine.

cheers
Riles

Have not tried the alexandriasc.com utility but tanukisoftware.org's server wrapper works will. Also comes with JBoss instructions.