Variety of attacks against computer systems have been able to succeed, the key reason is the computer system itself, there are a variety of weaknesses, but these weaknesses are often hidden among the computer system has superior characteristics, often by illegal userscontinue the use of the computer’s operating system, we must make the appropriate security settings, in order to prevent the invasion of illegal users.%针对计算机系统的各种攻击之所以能够成功，关键的原因是计算机系统本身存在各种各样的弱点，而且这些弱点往往隐藏在计算机系统所具有的优越的特征之中，因此常常会被非法用户不断的利用，为了防止非法用户的入侵，我们必须对计算机的操作系统进行相应的安全设置。本文分别对BIOS的安全设置、Windows密码的安全设置、Windows系统的安全设置进行分析，系统的探讨了计算机操作系统的安全设置与防范。
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