I've followed the instructions to the letter. when I try to install from disc, icon disappears from mac desktop (10.4.8, 1K gb ram) and fails. When I direct parallels cd drive to image path (i created an .iso), it still wants to look in the drive and even changes it back to the actual drive from my image path. I can't get this thing to install. Custom, typical, express, I've done it all.