Thanks Rich,
I just installed 3.041 to see if that made a difference and it didn't. I've also performed all the XP optimization techniques with no success. I tried Safe Mode, nothing, in fact I'm getting the same response whether or not the SS USB cable is plugged in or not. Of course when the USB is not plugged in, I don't get the red & blue glowing LEDs on the SS.
If there is some diagnostic I can run to give me a sanity check it would be great to know. BTW: I've used this same computer with the PP and it works great with Mach3 (any version) I've never seen any Mach3 generated errors until I plugged in the SmoothStepper.
Your help is greatly appreciated, I at a standstill here until this works!
Thanks,
-Robert