Problems with my website

Hi all i have just been up loading to my website agen most of it is working now but there is a number of down loads from my site that are not working and i dont no how to put this right at all i have tryed every thing i can think of but as i have never done this before i no i am doing something worrg in some way i have looked at the ones that someone has done for me as they are working but i can not see what i am doing diffarent to them if there is any one out there that can help me i would be very gratful for the help. I will be doing a lot of work on my website over the next month or so to get it right and working right in every way so i dont have to do anything with it after as it will do all the work for me all i will need to do is take the money out of my paypal account now is that good or is that good i think it is i will never need to work agen all i need to get now is the traffic to the site then i will be off thanks for reading Darren