I had Windows 2K for a time, and never had that problem. I did get this message a lot, and it was false: (it went something like this:) There is insufficient disk space to render at this resolution. The message was not consistent. I'd get it sometimes with one render, but not other times. There didn't seem to be an easy, dependable solution. In the end I yanked Windows 2K and installed Windows XP. I got that insufficient disk space message ONCE with Windows XP. I merely defragged the hard drive, and didn't see the error again.