Question

why does computer virus happens
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Answer 1

A computer virus is a software program designed to replicate itself and spread to other medicines.. Viruses can enter your computer in any number of ways, such as via an email attachment, during file downloads from the internet or even upon a visit to a contaminated Website.....

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Answer 2

Answer:

A computer virus is a malicious program. designed by the software engineers and those who use their expertise for malicious purpose...

Some computer viruses are programmed to harm your computer by damaging programs, deleting files, or reformatting the hard drive. Even less harmful computer viruses can significantly disrupt your system’s performance,  and causes frequent computer crashes.

symptoms

Your computer may be infected if you recognize any of these malware symptoms:  

• Slow computer performance

• Erratic computer behavior

• Unexplained data loss

• Frequent computer crashes

Explanation:

Hope it helps uhh....:)