Get the "Fix" for OS 9 here:http://raystew.virtualave.net/downloads/os9fix.html Make sure to update before trying to launch the application. There is a problem in that a couple of the RDS extensions need to be locked, I don't remember which ones. By the way, nice machine. I have a G3 Pismo & love it. Not sure about the install problem itself, make sure to trash any vestige of the previous pieces & perhaps rebuild your desktop file before re-installing?