Thanks to all who helped. Alas, the reinstall from the Poser 3 CD didn't work for me (I must be one of the unlucky ones). So I deleted the directory, removed the icons, and searched through the registry for occurrences of "Poser 3" and deleted those subtrees as well. After a reboot, most everything seemed to be more or less cleaned up, and I was able to install Poser 4 and get on with the fun. Thanks again!