what is computer virus and how does it affect the system
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Some computer viruses are programmed to harm your computer by damaging programs, deleting files, or reformatting the hard drive. Others simply replicate themselves or flood a network with traffic, making it impossible to perform any internet activity.
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A computer virus is a malicious software program loaded onto a user's computer without the user's knowledge and performs malicious actions. ... It can self-replicate, inserting itself onto other programs or files, infecting them in the process.
In general usage, the term "computer virus" includes all forms of "malware," or malicious software. Instead of sniffles and a fever, some common symptoms of a computer viral infection are slow performance, data loss and system crashes
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