Why might my progress bar not keep up with the actual progress of my download?

Say I'm downloading a 700MB file. My progress bar says the download is 2% done, but when I look at the actual file size in my Library window or in Explorer, it'll be 718MB, and will even have a time in the duration column (in Explorer). By all accounts, it's done downloading, but Limewire doesn't seem to realize it, and it won't actually wrap up the file so that it will play right until the progress bar says the download is done. So I have to keep it downloading for hours (even days), instead of minutes!

HELP!!! This keeps happening!!!

Rachael