Thanks Alyson, glad it worked. The .bat file is basically acting as a pointer to that .jar (or the command line version if passing in additional parameters), so I'm not sure why the .bat itself isn't working if they're in the same folder.
Anyway, yes you can execute the .jar directly without admin rights, although you will need permissions that allow you to traverse the folders and files you wish to scan - basically if you can reach and read a file you can scan it.
David