I had both Windows XP Professional (Release Candidates 1 & 2) and Windows XP Home Edition on my computer. I can't think of any difference in appearance between the two versions of Windows XP. If there are any such differences, they must be subtle. One of the hallmarks of Windows XP is that they got rid of the old DOS/Windows 3.x code. I'm not sure how to describe that concept at this time, but it has been highly publicized and acknowledged. I still go back to the fact that I only had the "out of space" problem once with Windows XP. I've never fiddled with the swap file settings, and in fact I believe that fiddling can often cause problems. In the past threads where this concept was discussed, the results were at best divided. I always look to forums and newsgroups for any information concerning computer-related issues that I need help with. I always look at what a person says, and get a good feeling how accurate or knowledgeable that person is. The Curious Labs responses to this issue did not inspire confidence. In at least one instance, they said they had no idea what caused the problem, or really how to fix it. They said to try the swap file thing, but that it might not always work. In fact others said it didn't. I have an idea Curious Labs didn't want to spend much time on this known issue for several reasons. Windows 2000 Pro is now "an old operating system," since Windows XP came out. Curious Labs is working on Poser 5, and most likely already made some changes to eliminate that problem in the future.