|Ok, are you able to ping the server from the one workstation? |
If yes, then it would seem to be an authentication issue. Do you have a user account for the aforementioned problem computer created on the server and added to the ACL for the share? If not, or if you set the wrong permissions on the account, this could happen.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.