Also, just as a note, when I try to search the forums, I get this:
Cannot invoke the operation : the module threw an exception
Problem with the server?
With 5.0.x you will need JBoss Native (the jbosssvc.exe that ships with AS 5.0.0 and 5.0.1 is corrupt), but with AS 5.1.0 you don't need JBoss Native (the jbosssvc.exe works)
I assume that you meant "it's written for 4.x". The instructions can be used with 5.0.x also. Basically, unzip the Native zip file into jboss_home, overwriting the existing files in the bin directory. Then run service.bat.
By the way, you only need the few files in the bin directory of Native - the files in the subdirectory are for using the Apache Portable Runtime, which are not required to run as a service.