You should verify your preferences whenever your applications unexpectly quit or something crashes. Verify Preference Files: Sometimes Preferences Files (.plist) become corrupt.With 10.4 or 10.5 your prebindings are updated every time you run an Apple Installer. Update Prebindings: Prebindings allow applications to launch faster.In that case, you may want or need to run these manually. If your computer is shut down or in sleep at the designated times, the maintenance does not occur. Periodic Routine Scripts: Mac OS X performs background maintenance tasks at certain times if the computer is not in sleep mode.IceClean is a powerful System Maintenance and Optimization Tool using only UNIX built-in System Tasks to help your Mac stay healty and to keep it running smoothly.