保证计算机系统的安全，保证电脑软硬件正常运转，已是广大电脑用户迫切需要了解和掌握的技术；维护好电脑正常高效地运转已成为用户的基本要求。-Guarantee the security of computer systems to ensure the normal operation of computer hardware and software, the vast number of computer users have an urgent need to understand and