The biggest problem is with Poser 4.03 not overwritting older files. If you: 1.) BACK UP CUSTOM FILEs 2.)Unistall Poser 4 3.)Seek out the remaining folder and delete it. 4.)reinstall and patch before launch. It will be infinitely more stable. This could be a system limitation and not the installer. NOTE: Propack patches to 4.03 by itself. Patching Poser 4 and then 4.03 and then Propack has the older files issue. Be aware to that there are some OBJ's and custom figures with extra data (like empty group lines) Poser will have issues. Always test an issue with a standard library. Toddio