I have gone into system config and added the mp3 extensions and the mimetypes  and I still get this.

I have Joomla 1.5.18 and the the version 3.1 of All videos.

What do I need to do to upload files to my local host  -  I am trying to use the media manager

Thanks in advance for help

Please upgrade to the latest version and read carefully the documentation in order to see where to save your files.
www.joomlaworks.net/content/view/35/41/

I had the latest 3.3  I got the version from the documentary.

Anyway I uninstalled and reinstalled.

i went to media manager
went to the folder images/stories/audio  (I had to create the audio folder)
I tried to upload an audio file (size is 1.5MB way under the 15MB I have set for uploads on this server)
and I get this error.

Not a valid image.

Do I have to do anything i global config or something. 

Please provide me with a link to your site.