How does Long-term computer virus work?

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Long-term computer virus: Computer viruses often take advantage of the weaknesses of the operating system to spread and improve the safety of the system is an important anti-virus, but a perfect system is non-existent, too much emphasis on the safety of the system will enable the system most of the time for virus checking, the system loss of availability, practicality and ease of use, on the other hand, the requirements of the confidentiality of information so that people in the leak and can not choose between seizing the virus. Virus and anti-virus technology will be used as a long-standing confrontation, with the two technologies will be the development of computer technology and the development of long-term.