I'm having this problem too... i have a file @ 48% and it's getting 500+k/s and just not finishing. It's been an hour and still getting similar speeds and should have finished already... I deleted the incomplete and limewire folder that has nothing in it but this isn't doing anything.. maybe there needs another patch?

Hey I just figured out what to do. Go into your library and click the incomplete files folder. delete everything there and you should be good to retry anything that you didn't leave in there.