Broadly defined, a computer failures could cause, the destruction of computer data procedures collectively referred to as computer February 18, 1994, China officially promulgated and implemented the "People's Republic of China Computer Information System Security Protection Ordinance", "Regulations" Article 28 clearly pointed out: "computer virus, is compiled in a computer program or inserted in the Damage or destruction of computer data functions, the impact of computer use and self-reproduction of a group of computer instructions, or " Computer viruses are the main hazards: Computer virus to stimulate the direct destruction of data, most of the time the virus directly stimulate the destruction of important computer information and data, Occupation of disk space and information on the damage, Seize system resources, Impact of computer operating speed, Computer Virus error and unforeseen hazards, Computer viruses on the compatibility of the impact of the system is running, Computer viruses to users cause serious psychological Computer virus on the harm is well known, ranging from machinery impact speed, heavy damage was caused crashes or For the convenience of the computer at any time for maintenance and maintenance, must be prepared to tools, such as clean dos startup disk or windows startup disk, and kill the virus and disk software tools to cope with the infected system or hard drive could not be activated, and so It should also be prepared to various parts of the driver, such as drive, sound card, video card, modem, and so And the floppy disk drive cleaning and washing liquid, should also be