Computer virus

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…writing anti- virus software and the programmers writing viruses are one in the same. However, the author of a computer virus means nothing to one whose machine has lost data or has crashed due to infection. Detecting and deleting the virus becomes the immediate action needed. This is impossible without anti-virus software, and would be much simpler if the software is already installed on a system. So, keep your computers "vaccinated," because, it is contagious.