When I open a folder containing music files in Windows XP, there is a link at the side which says "Play All". If I click on this it should open up Media Player and play all the music files in the folder. It used to work, but now nothing happens. Nothing also happens if I select some files and then click on "Play Selection". I can still double click an individual file and it will play okay. It's the same for all music folders, not just one. I guess I must have changed a setting somewhere, but I don't know what. Any ideas?