This means that nobody who is online on the Limewire network has that file (theoretically) for you to download. You can click on the file (hold the control button and click them all if there are multiple files) and then click the Resume button at the bottom of the downloads/Search page. This will change the status to "Queued", and Limewire will then search to see if any new sources of the file have come available. You may notice that each time you log into Limewire (I only run mine overnight, when I get free unlimited downloading, hence log off during the day) all the files on the list are returned to "Queued" status, and Limewire then searches through them at that point to see if the equivalent files are available to download. If it's been ages and nobody on the network has that file any more, it is worth running the search again to see if any other different files with the same content are available. Go for ones with the highest frequency, as obviously if 13 people have the same file, the download is more likely to complete than if only one person has it - you never know when they will go offline! I sometimes find that when the status is "need more sources" then searching for the same file will make it somehow re-find files it hadn't "noticed" were there before, so obviously Limewire doesn't find everything!