A couple of points to clarify the situation: 1. The problem is not the xp client computers accessing the files on the server 2003 computer. They can access all shared files in the server 2003 computer fine. and also on each other. 2. Strangely, the problem is the server 2003 being unable to access some of the shared folders in the xp server computers. 3. This only started happening recently. For years I did not have any problems and all computers were able to access each other's files fine without any inclusion of user accounts in them or the like. I just shared the hd's and that was it. I suspect that something is wrong with the server installation. but what?