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Why do I need antivirus?

Without antivirus software, viruses can infect your computer. A computer virus attaches itself to, overwrites, or otherwise replaces, another program in order to reproduce itself without your knowledge. This may quickly use all of your computer’s available memory, drastically slowing down the system or bringing it to a complete stop. Viruses may damage or attempt to destroy files or make disks unreadable. Viruses can delete files, reformat hard drives, or confuse the data on them.