i believe, from the little that i understood that when u uninstalled bryce four, some shared file with five were uninstalled together.... so, based on this, windows still thinks that u have bryce 4 installed right? deal is sometimes win don't recoganize versions.... I'd try to del the bryce folder, there shouldn't be any prob with shared files since corel place them somewhere else... and then reboot and try to install again. if u r using win me,2000,xp it might be wise to try the system restore, it usually does a good job... if not perhaps reintalling 4 and then uninstalling then installing 5.... if nothing works do what bill gates use to do back when he was begining (and where windows got it's name from) .... trow the comp out the WINDOWS!!!!!!!!!!!!!!!!! just my two cents