Asp will not read directory

I am using ASP to read my directory for files ending with mp3, then truncate the mp3 extension and use the file name as a link to that file that when clicked will play the mp3. THis works fine on my hosting server, but not in my IIS. There must be a setting that I am missing. I have given the root directory for my site all permissions - read, script, directory browsing, and write. Any suggestions will be most helpful. Thanks, Bob.

It was my script blocker in Norton Antivirus. One thing was confusing - when disabled, NAV is not really totally disabled - the script blocking is still alive and well. It must be disabled within NAV - options, script blocking. Once disabled, it can be reenabled again and all will work fine.