I am having trouble on a Win2000 machine as well. My service pack is saying that I don't have Poser 5 installed on my system. I DID install the software directly off of the root -- C:Poser 5 and think that might be the problem(?). I've tried moving the patch file directly into the P5 folder, moving my entire Poser 5 folder into "Program Files" but nothing seems to work. I too have Administrative Privledges, etc. Don't know what else to add here as far as details of my system. Any takers? Thanks