I have the newest limewire pro, i'll start to download a big video file and it will download so much until i close it down and switch my computer off, but when i switch my computer back on and go to resume my downloads they all start again as if nothing had been downloaded, my video file which was on 60% when i switched it off is now back to 0%, why does it do this and what can i do, i dont really want to leave my computer ont 24/7 for a file to download especially if its downloading slow.