knights advises "It's a Windows 2000 problem." With all respect I do not believe this is true. Certainly the problem may appear in W2k but it is not exclusive to that OS as the above statement suggests. One of my notebooks runs w2k and has never exhibited this difficulty. I just purchased a considerably more powerful notebook computer which came with Win XP. This newer one was where my Poser "out of disk space" render message appeared. As per my previous message, increasing the size of the virtual memory file solved the problem.