What is a computer virus?

What is a computer virus?

A computer virus is a small software , transmitted from computer to computer , which disrupts the operation of a machine . A computer virus can damage or delete data from the computer , use an e-mail program to spread to other computers, or even erase everything on the hard drive element.

Computer viruses are often spread via attachments to e-mail or via instant messages. That's why you should under no circumstances open an attachment without knowing the sender of the message, or if you expect the reception. The virus may appear as attachments in the form of humorous images, greeting cards, audio or video files. They also spread through downloads on the Internet. They can be hidden in pirated or other files or software programs available for download .




Symptoms of a computer virus



What is a worm?

A worm is a computer code that spreads without user intervention . Most to be found in the attachments that infect a computer when they are opened . The worm infected analysis to search for files , such as address books or temporary web pages that contain e-mail addresses for computers. The worm uses the addresses to send infected emails and frequently reproduced (or spoofs ) the addresses of senders in the last messages to the infected messages appear to come from someone you know . Worms then spread automatically via e-mail, networks or vulnerabilities in operating systems, these systems often overwhelming until the cause is known. Worms are not always harmful to computers, but they usually cause problems in performance and stability on the network and the computer.

What is a Trojan?

A Trojan horse is hidden in other programs malware . It enters a computer hidden in a legitimate program , such as a screen saver . He then inserts a code in the operating system that allows a hacker to access the infected computer. Generally, Trojans do not spread by themselves. They spread through viruses, worms or downloaded software .

What is spyware?

Spyware can install itself on your computer without your knowledge . These programs can change your computer's configuration or collect advertising data and personal information . Spyware can track users ' browsing habits and can also redirect your web browser to a website other than the one you intend to visit .

What is a security software unauthorized ?

Security software unauthorized attempts to make you think your computer is infected by a virus and usually prompted to download or buy a product that eliminates the virus . The names of these products often contain words such as antivirus , shield , safety, or auditor , which makes them appear legitimate . They often run immediately after download or at the next time you start your computer. Software security can prevent unauthorized opening applications , such as Internet Explorer . The rogue security software can also display legitimate and important Windows files as infected . Pop-up messages or conventional error messages may contain the following information:

Warning!
Your computer is infected!
This computer is infected with spyware and adware .

Note If you receive a message from a pop-up box that looks like this warning, press Alt + F4 on your keyboard to close the dialog box. Do not click inside the dialog box . If a warning as it continues to appear when you attempt to close the dialog box , it is a sign whether a malicious message.

Do you really navigate this page ?
Your computer is infected! They can cause data loss and file corruption and should be treated as soon as possible. Press CANCEL to avoid this situation. Return to System Security and download the application to protect your computer.
Press OK to continue or Cancel to stay on the current page.

If this kind of message , do not download / do not buy the software.

What is malware?

Malware is a term used to describe software designed to damage a computer system or perform actions are unwanted . Examples of malware :
virus
to
Trojans
spyware
Rogue security software