I was trying to install Adobe Photshop Elements 3.o on mac 15" powerbook, the install errored and after that all my applications (word, excel, safari, system profiler, all of them) are gone! I have the data backed up and the data isn't affected, just the applications. I am on version 10.3.9 1.5 ghz Power PC. 512 ram. this is my mom's machine and it has hardly been used.