Um ... when you are downloading a file it starts as an incomplete file... until it is complete ..then it becomes a complete file. If the downlod fails for any reason, the part you have downloaded will remain in your incomplete folder for as long as you have chosen to keep incomplete files in options. You may be able to resume the download later from where you left off before. Alternatively you can go to Limewire's library ... selecct the incomplete file you do not want to keep and delete it
WARNING ...NEVER Delete a complete file in the Library as you will remove it instantly from your computer!!!
I hope this helps