If you deleted them from your limewire library they would be gone...You are probably still seeing the uploaders as they where there before you deleted the files...
Try shutting LW down and they should be gone....
Just to be sure though try your computers search function and type the file name in....
If you would ever like to preview a file whilst downloading get the WMP codecs as VLC wont preview in earlier versions of LW...
This is a good codec pack....
http://www.xpcodecpack.com/