Swiss Centre is a upnp server. I do not think it is dlna

I am using a Pinnacle ShowCenter 250HD. I have tried out Swiss Centre Media Server and that shows my cover art.

I built my library in Windows Media Player 11 initially and added cover art there.
I have also linked the cover art to mp3 files by using a tag editor after ripping CDs.

Do I have to do this album by album, track by track or is there a simple way of refreshing the data to pick up all the cover art?

I have just downloaded the wild media server and have got it up and running very quickly.
However I can't find out how to display the cover art on all my music.
Any suggestions?