The folder is locked? OK, so OS 9 is there, but perhaps in a folder that belongs to the prior owner? It would help if you'd post your system information. . .upper left hand corner, click the Apple logo, then "About this Mac" then the "Apple System Profiler" then file and save. . .this will produce a text file which will let someone help you. . . There is no personal information or passwords in this file, so its safe to share. . .