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1) Do Not browse websites that you don't trust. .
Do Not open emails from anyone you don't recognize.
Do Not allow people to use your computer without your knowledge.
Do Not download and run unrecognized software, especially files with an .exe extension.
2) A Trojan horse, or Trojan, is a type of malicious code or software that looks legitimate but can take control of your computer. A Trojan is designed to damage, disrupt, steal, or in general inflict some other harmful action on your data or network.
3) Unusually slow performance.
Frequent crashes.
Unknown or unfamiliar programs that start up when you turn on your computer.
Mass emails being sent from your email account.
Changes to your homepage or passwords.
4)boot sector : Boot sector viruses infect the system area of a disk; that is, the boot record on floppy disks and hard disks
trojan horses : A very important distinction between Trojan horse programs and true viruses is that they do not replicate themselves. Trojan horses contain malicious code that when triggered cause loss, or even theft, of data. For a Trojan horse to spread, you must invite these programs onto your computers; for example, by opening an email attachment or downloading and running a file from the Internet.
5) Malware : Malware is any software intentionally designed to cause damage to a computer, server, client, or computer network. A wide variety of malware types exist, including computer viruses, worms, Trojan horses, ransomware, spyware, adware, rogue software, and scareware.
Adware : Adware, or advertising supported software, is software that displays unwanted advertisements on your computer. ... Adware is a more succinct name for potentially unwanted programs. It's not quite a virus and it may not be as obviously malicious as a lot of other problematic code floating around on the Internet.
Spyware : Spyware describes software with malicious behavior that aims to gather information about a person or organization and send such information to another entity in a way that harms the user; for example by violating their privacy or endangering their device's security.
Spam : These malicious programs spread rapidly and generate massive amounts of spam pretending to be sent from legitimate addresses.
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