I have a problem that I need to resolve in a quick timely manner. I need some good opinions from everyone. I have a PowerPC G5, Silver tower, with 1 gig of RAM. I installed OS 10.3.9 on it instead of OS 10.4.11. Don't ask why. Itunes 4.0 comes with OS 10.3.9 which I am trying to figure out a way to either upgrade OS 10.3.9 to 10.4.11 or try to find iTunes 7. I am sure I will get the answer to upgrade rather than to install iTunes 7. The problem is, how do I upgrade the OS without risking losing any existing files and documents? I can't afford to lose any data especially if it is not mine. If I have to upgrade the OS then I will but the upgrade has to go smooth without any data loss. Any suggestions?