Arrange your downld window by size (click or double click the top of the size column bar.) Then see if there's any other listings of the file in question. Arrange your incomplete folder alphabetically by clicking top column bar of file name. Then delete the files in question if they're still listed.

I hope you're not resuming from the Library window/force resuming shortcut. This may force any incomplete to resume.

Try deleting your LW Preferences folder whilst LW is closed; instructions here: Fixes for Limewire