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Viruses can infect your computer through internet downloads
Since no security method is considered to be totally safe, it is important to make backup files of the important files, regularly before we face a virus or other problems.
Never open an email attachment which comes from an unknown sender.
Don’t insert in your computer CD, DVD or flash discs, if you are not sure about their content. They may have some type of virus.
A hacker is someone who breaks into someone else’s computer system, bypasses passwords or licenses in computer programs; or in other ways intentionally breaches computer security. A hacker can be doing this for profit, maliciously, for some altruistic purpose or cause, or because the challenge is there.