Cmputer Vrus has Its Reasons to Exist - 1

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"Why my new computer becomes increasingly slow?" a customer was asking a maintainer, "I think it must be infected by some viruses." "OK! Let me see..." the maintainer said, "Yes! It's always there!" Nowadays, if one said he/she must be laughed at his/her ignorance. Yes! Computer virus is so notorious that nearly everyone had suffered from their invasion. If there is no computer virus, we won't need to worry about our files in the computers destroyed, to buy those expensive antivirus softwares which always leak some viruses to us as if they are blind, or to meet the maintainers peridically for us just as the disgusting flies. So why these annoying computer viruses still exist? to be continue...