Image not loading to clients-No error code

I am having an issue with a image not loading to a client. I have created a clean computer, and have uploaded the image cleanly to my server. When I try to download the image to a client machine, the image moves very slowly, and after about 2 hours and only 10% downloaded, the image stops, with no error code, no messages. I tried to do the same thing via multicast, and the same thing happens. The master computer shows a message that "All clients lost." I even tried this with another client, just to make sure that it wasn't the machine. Same thing happens. The machines have a Realtek network card, so I do not think that is the problem.

Any help or advice will be most welcome.

Thanks.