first question is - why uncompleted files?
are you switching off limewire at night or something?
if so do you stop or cancel download? if so DONT
just pause them - then disconnect limewire and shut down
when you restart they should all start automatically from where they left off

if you see "need more sources" -dont give up - just pause it for a while and try later - the computer(s) you are trying to get the file from are probably off for some reason

its also good practice to empty your "incomplete" folder when you aren't downloading anything and have nothing waiting