Win2K and okFrontPanel.dll


I have been using a program written with VC6 and the dll that came with FrontPanel 1.3.1 to communicate with my xem3001v2 on many WinXP machines. Today I tried to run the same program from a Win2K SP4 machine, but it could not open the xem device. I found that on the Win2K computer okFrontPanelDLL_LoadLib() returns false, no matter where I put the okFrontPanel.dll file. The Win2K box has USB 2.0, and I can successfully run the sample apps that came with FrontPanel. What do I need to do to get the dll interface to work with Win2K?