We have compiled a list of very useful papers for you to download free, On topics of computer maintance and security,
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• There are two vital parts to effective virus protection, both the software application and the definition files must be kept current.
  
• You must maintain current copies of both the application software and the virus definitions in order to be properly protected.
  
• There is no guarantee that any virus protection will keep your computer safe all the time.
  
• Because virus fixes take time to create, there is always the potential for infection between new definition releases, or undiscovered viruses.
  
  
• Even if there is a virus definition fix for a virus infected machine, there is no guarantee that the infected data can be retrieved or cleaned of the infection. There are occasions when the only appropriate action is to delete the infected file or files, in order to restore the machine.
  
  Source: University of Louisville