I'm using Windows 2000, which is also a good point. The old laptop that worked used NT. I was forced into migrating the system to 2000 by the IT department.
I have a PC using an OPC based VB6 program to pull data out of a SLC 5/04 over DH+. This same PC is on our company network where it writes the information to an Access database on a network drive.
When we initially setup the system, we used a laptop with an AB PCMK card and had no problems...