I'm sorry it took sooo long to get back to you all, I got tied up with other issues I had to fix.
@SeldgeDG: The CNC machine has AT BEST a 386 cpu/MB combo in it (I don't have it in front of me atm, but I want to say it may even be a 286). It runs WFW for networking connectivity only - the actual software that drives the CNC machine, that interprets the GCode is a DOS based application - the interface card the connects between the computer and the actual drive mechanism is a ISA board (this board is part of what the software is specifically written to control). All of this is contained within the CNC machine itself and can't just easily be changed. I wish it was easier, trust me
@cluberti: I tried reducing the security encryption level and the authentication level, but I still keep getting the asking for username/password even when using user account credentials that are legitimate for accessing the WFW share.
I *could* put XP on these boxes, but we are really wanting to move the computers themselves into a more modern operating system, especially as we are starting to get to a point of wanting/needing more RAM for many of the applications that are required.
I thought of using MS virtual PC, but that creates a bunch of other issues, including the fact that it will reduce the performance level of the system, give a user access to something we don't want them to have access to, require yet another tool to be always running and require its own AV making the overall machine require twice the work and maintenance.