On the contrary. Poser should run better under WinXP than under ME. I also went from ME to XP ( before I got P5 though) and everything is fine. But XP loves memory and so does Poser 5. How much RAM do you have?

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.