From what I understand, Vista is notorious for allowing any changes to occur within the Programs File Folder without proper authorization through its UAC.  With that said, if you have installed your Poser 6 within the aforementioned folder, there is a very strong likelihood that your saved files have been relocated to another folder.  I do not use Vista and I do not recollect where the new default folder is located.  Hopefully some one else can jump in and steer you in the right direction.  This has been posted before sometime ago.