Jeepers, I've used Windows XP Home Edition for months now. I've had no problems. I recently did a picture with the entire DAZ Mansion Great Room and all its props. That was the first time my computer started complaining about not having enough virtual memory. Windows XP said it would go ahead and fix the problem. Everything worked just fine. It didn't take hours to render either. You might want to make sure you defrag your hard drive, do routine maintenance, and that you have all the latest hardware and software updates.