OK, so I ran a new installation of Panther on my iBook when I couldn't get a start-up screen. Then I did the Software Update so I am right back where I was before at 10.3.4. So I had to do this twice in two weeks and it used up about six GB of space that I could really use. I haven't had to change any files other than downloading Safari 1.2 again, so am I able to delete "Previous System 1" and "Previous System 2" from my HD? The comp is running fine now, but I don't want to delete anything from Developer or Library that could screw me over later. Thanks.