Rick,
RAM is not an issue in this case since some of them have more than 600MB RAM. I don't have detail on the secondary running programs but they should be similar except the application/services installed with the OS. Don't have the info on netword cards and video cards. But the problem does not occur if running other applications (I assume non-VFP applications). Also copying and opening files on the server from the workstations have no problem too.
It is just somehow it takes about 1 minutes to load up a VFP form. The strange is if the workstations are Windows 98 SE, then the problem is not there.