Spyware is software that is designed to spy on you and what you do. Protect your computer with an anti-virus program! Some viruses spread through programs that can be downloaded from the Internet or from storage media that have been used in infected computers. Viruses often spread through e-mail the virus is activated when you open an attachment (usually by double-clicking on the attachment icon).
load more Trojans or viruses to the computer. send junk mail in the name of the victim. 
read passwords, e-mail and banking information that has been stored on the computer. When this is done, crackers can find infected computers with their own programs and take over the control of an infected computer with the aid of the Trojan. Users are tempted to open the program containing a Trojan with their own computers so that the feature hidden in the program can infect the computer. Trojans or Trojan horses are computer programs that are spread along with other programs that seem useful. Worms can also block the entire web traffic of an organisation as it advances like a chain reaction. Worms usually spread very rapidly, since they can send themselves to all the addresses in the address book in your e-mail program, for example. This means that a computer that has been infected with a worm will try to infect other computers on the web, by resending itself every time the computer is turned on. Worms are malware that spread on their own and send perfect copies of themselves over the web. The simplest way to prevent viruses from spreading – and your own computer from being infected – is to always scan any files you receive or send for viruses. 
You can affect how viruses spread, because viruses do not spread without human assistance. Some viruses are merely annoying, but others can cause real damage they can delete files that are important for the computer to function, for example. The virus can damage hardware, software or files. Viruses are malware that spread from one computer to the next by attaching to a file. the damage is caused both to the owner of the infected computer and other users, so it is very important to protect your computer against malware. Viruses and spyware are some examples of malware (malicious software) that can cause a great deal of damage if they invade your computer.
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