I had to uninstall Poser 6, move my downloads folder full of installed content to a safe place, delete the entire Curious Labs folder tree then reinstall P6 from the CD in order to get this f***r to install. So, the boys and girls at e-Frontier have done it again!; causing the absolute maximum inconvenience to their long suffering customers. It's obviously a thing with them - make life hard for the customer and that'll bring 'em rushing back for more ;)