Jay, I have the same computer system you do, and windows XP. It sounds like you've gotten some great advice on the swap files, etc., but I wanted to offer one quick and dirty trick to try first. When I get the error regarding not enough disk space to render, I go the folder: Document and Settings->(username)->Local Settings->Temp, and delete all the files. Then I'm able to continue rendering without having to shut down Poser or change the swap files, etc. Not sure if this will fix your problem, but its really easy and worth a try. Matt