I'd only received this error message with Windows 2000 Pro and Windows XP. In simplistic terms, Poser sometimes has a conflict with your Windows swap file. My easy fix was to install Poser on a different hard drive than Windows. After that change, I rarely received the error message. If I did, it was time to defrag the hard drive. Curious Labs, and others, state that you can adjust your swap file to fix the problem. I always hesitate to change the swap file.