Vista - coping file from a remote file share - FILE IS NO LONG THERE bogus error message

I am having issues trying to access files that are located across my WAN.
When I try to copy them to my local Desktop or Hard Disk I get an error
saying "Cound not find this item" "Verify the item's location and try
again." On XP I have no problems accessing the same data across my WAN.
This problem seams to be isolated to WAN connections, because I do not have
the same problem when I access files on my LAN. Maybe it is some kind of
Timeout issue with Vista and WAN transfers.

Any help would be much appreciated.


Thanks

Heith