It happened when I installed Leopard. Now tons of my applications won't quit, even though it seems like it. I also have to force shutdown when I move my computer. I also can't restart. My admin account is not an admin anymore. Can anyone help? My third-party bar on System Preferences includes Growl, Intego NetUpdate, MediaCentral, Menuet, Xbox 360 Controllers and xGestures. I have an iMac G5 with a 1.9 GHz PowerPC processor and 1 GB DDR2 SDRAM for memory.