Don't know about the drivers (dll's ?) that you are using to communicate with your ISA or PCI card so I can only make a couple of suggestions:
1. Be sure the lvrt.dll version is the same on all machines. In Windows Explorer, you can right mouse click on the file and select Properties to view version info.
2. Make sure the ISA or PCI driver is in the search path. I would also check to make sure the versions
of the drivers on the development machine are the same on the target machine.
3. Creat an INI file for your EXE. The following webpage contains an example that will make the INI file for you:
http://zone.ni.com/devzone/explprog.nsf/6c163603265406328625682a006ed37d/44bf2a60a7a3188786256774004ea312?OpenDocument