System crashes and application quits can be downright annoying, but you learned in this chapter that you are not helpless against them. You learned to force quit unresponsive applications and to restart unresponsive computers. You discovered the secret of resetting your password with your system install CD. You also learned how to set up a preventive regime to defend against computer viruses. Finally, you learned how to reinstall your operating system in case your computer begins to experience wide-spread failures.