Thanks videodv, that worked and all installed. Got the 4.01 upgrade and installed that too. I appreciate the help. Though I am completely new to this type of program (well, I have used Terragen on and off, more off than on as it's so frustrating finding a decent POV) I created a very basic render within minutes, and must say that it looks pretty friendly to get to grips with, and fast rendering too. Thanks again! Les