My first response echos Curious Lab's recommendation. However, I was not offended at all by your response: "Windows XP (virtual memory) and Poser are competing for space. My easy fix was to put Poser on a different disk than Windows XP> I still get that error, but only rarely. The fix then is to defrag the hard drive. You can try resetting your virtual memory. I am too shy to fiddle with that."