Hi,
going to need a lot more info than that before anyone could make a guess.
What PC do you have?
What OS is installed, especially is it 32 bit or 64 bit?
What is your motion controller....parallel port or UC100 or Smoothstepper or....?
If its a parallel port machine what does DriverTest.exe reveal, and I mean a screen shot not some meaningless 'excellent' or 'pulsing to fast'?
Craig