System Preferences Not Saved


I finally got my computer up and running - see previous question "Blue Screen". However, now changes I make in System Preferences are not saved. Specifically, when reconnecting to the Airport - I select the network, input password, select "show in menu bar" - I click Apply Now - quit SP, get a window asking if I want to apply changes I click APPLY. Nothing happens, I go back into the SP and the information I just input is gone. No network info, even the Show in Menu bar is deselected.
I did an Install & Archive when I reinstalled the OS X.2 on my Power book G4. (after running Disk Warrior 4 times)
After nearly a month I've finally got my computer to get past the spinning dial, now I can't get online.
Thanks for your help!