My reply is at the bottom of your sent message:

I'm not Administrator and likely the administrator(s) of the newsgroup won't
be responding to your request - they don't think you're important enough. So
you're stuck with us lowly folks. :)

Anyhow... Check for latency - that's USUALLY the reason. Are you getting a
specific error message? Are the wires all crimped properly? Is there
additional traffic that's resulting in packet loss? What's the architecture
of the network look like? (No, don't answer all the questions - those are
just places for you to look to troubleshoot it on your own. Networking
issues such as the one you're mentioning are troublesome to diagnose without
being there I've found.)

Are there issues when you browse to the network share with something other
than Windows Explorer? Can you setup a small server (there are a billion
free ones out there) that will enable you to share it that way, browse to it
with the browser of your choice, and check to see if you can transfer stuff
that way?

While you're at it - please post only once. I see you're using Google.
Don't. It's bad for you and ruins the internet. I think it even has been
known to cause cancer in lab rats in the State of California. (Other lab
rats in other States seem to be fine however.)

Access MS Newsgroups:
http://kgiii.info/windows/all/general/msnewsgroups.html