Downloading problems?

I am having a serious with this program, and it is getting very annoying. Ok, so this is the situation. First, I start downloading something, then it gets to around 40-50% or 65-80% (and this is where the problem starts). It says "2 hours left" then i check after 2 hours and the percent is either the same, or it went down 1-2%. It never finishes the download, I have kept Limewire on for about a week straight and no progress on the download. It happens either randomly or when I turn Limewire off and resume the download later (randomly most of the time though). What do I do so this problem does not keep occurring?

P.S. I have re-installed about 2-3 times

does anybody know?