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It's the PP that limits it as the DLL for the PP that can only run in 32 bit OS . That's why the switch to motion controllers USB or Ethernet has had to happen because the modern PP do not output 5vdc only 3.3vdc hence they do not have the power to drive the hardware So my system is a core duo optiplex running W7 64 bit pro and it's fine no problems now I have the correct software , this needs to be the current ver in all cases else it will not runStuart