This question has been answered numerous times before. The error seems to only show up with Windows 2000 or Windows XP computers. Here are the solutions: 1.) Curious Labs official recommendation is to readjust your Windows swap file. 2.) My main solution was to reinstal Poser onto a different hard drive than my Windows XP hard drive. After that I rarely got that error message. When I did, it was time to defrag the hard drive. By the way, your hard drive partitions really don't allow much hard drive space when you consider that Poser graphics can consume large amounts of space. You're better off having one hard drive with one partition. Just to give you a contrast, I have a 30GB hard drive that has Poser 4, and miscellaneous Poser-related files. I only have 8GB free, and it is time to move some stuff to CD disks and free up some space.