For some strange reason, the Finder window is not working on my Powerbook G4. Not only that, the only time horizontal bar at the top of the screen is visible is when I activate a program. Also, all the icons and files I had on the desktop does not appear there anymore, although I know they're still in the desktop folder and I can access them that way. I tried the archive and install routine but everytime 8% of OS X has been installed, some error occurs and the installation is stopped dead in its track. I'm not sure what to make of it all. Any help in resolving this matter is much obliged. Thank you!